13-letter words
There are 7,827 thirteen-letter words in our dictionary. The most common are INVOLUNTARILY, IRRATIONALITY, IRRECOVERABLE, IRREPRESSIBLE and IRREPRESSIBLY.
Long words like these rarely fit in one go, but they are the answers to many jumbles, spelling challenges and word-ladder puzzles. Most are built from a shorter root plus a common prefix or suffix.
13-letter words
- involuntarily19
- irrationality16
- irrecoverable20
- irrepressible17
- irrepressibly20
- irresponsibly20
- irretrievable18
- irretrievably21
- isolationists13
- isomerization24
- juxtaposition29
- kaleidoscopic24
- kapellmeister21
- kindergartens19
- kindergartner19
- knickerbocker31
- knowledgeably27
- lackadaisical22
- lactobacillus19
- landownership22
- laughingstock24
- legislatively20
- leishmaniasis18
- leptospirosis17
- lexicographer28
- lexicographic30
- librarianship20
- linearization22
- lithographers22
- localizations24
- lymphoblastic27
- machinability25
- macromolecule21
- macronutrient17
- magnanimously21
- magnetization25
- magnetometers18
- magnetosphere21
- magnification21
- magnificently24
- mainstreaming18
- malabsorption19
- maladjustment25
- malformations20
- malfunctioned21
- maliciousness17
- manageability21
- manipulations17
- manufactories20
- marginalizing26
- marketability24
- masculinities17
- masterminding19
- materialising16
- materialistic17
- materializing25
- matriculating18
- matriculation17
- maxillofacial27
- meaninglessly19
- mechanization29
- megalomaniacs20
- memorializing27
- meningococcal22
- merchandisers21
- metabolically22
- metallization24
- metallurgical18
- metallurgists16
- metamorphosed23
- metamorphoses22
- metaphysician25
- metastasizing25
- meteorologist16
- methylmercury28
- metronidazole25
- metropolitans17
- microanalysis20
- microcapsules21
- microclimates21
- microcomputer23
- microeconomic23
- micromanaging21
- micronutrient17
- microorganism20
- microscopical23
- microsurgical20
- microvascular22
- microwaveable25
- middleweights24
- millionairess15
- mineralogical18
- mineralogists16
- minicomputers21
- ministrations15
- misadventures19
- misalignments18
- misallocation17
- misattributed18
- miscalculated20
- miscegenation18
- mischievously26
- misclassified21
- misidentified20
- misinterprets17
- misperception21
- mispronounced20
- mispronounces19
- misremembered22
- misrepresents17
- misstatements17
- mistranslated16
- mitochondrion21
- mobilizations26
- modernisation16
- monochromatic24
- monochromator22
- mononucleosis17
- monosyllables20
- monotonically20
- monstrosities15
- monumentality20
- morphogenesis21
- morphogenetic23
- mortification20
- motorcyclists22
- mountainsides16
- mouthwatering22
- multicellular17
- multifunction20
- multispectral19
- multitalented16
- multitudinous16
- multivariable20
- multivitamins20
- mummification24
- musicological20
- musicologists18
- mycobacterial24
- mycobacterium26
- myelofibrosis23
- mystification23
- mythologizing32
- nationalising14
- nationalizing23
- necessitating16
- neoclassicism19
- neoliberalism17
- neuraminidase16
- neuroblastoma17
- neurochemical22
- neuromuscular17
- neuropeptides18
- neurosciences17
- neurosurgeons14
- neurosurgical16
- neurotoxicity25
- nitrification18
- nitroglycerin19
- nomenclatural17
- nonaggression15
- noncombatants19
- noncommercial21
- noncompliance21
- nonconference20
- nonconforming21
- nonconformist20
- nonconformity23
- nonconsensual15
- nondisclosure16
- nonfunctional18
- nongovernment19
- noninfectious18
- nonjudgmental24
- nonnegotiable16
- nonparametric19
- nonperforming21
- nonperishable20
- nonrefundable19
- nonresponsive18
- nonstructural15
- noradrenaline14
- noradrenergic17
- normalization24
- northeasterly19
- northeastward20
- northwesterly22
- northwestward23
- nortriptyline18
- nostalgically19
- novelizations25
- nullification18
- numerological18
- nutritionally16
- nutritionists13
- obliviousness18
- observability23
- observatories18
- obsessiveness18
- obstetricians17
- oceanographer21
- oceanographic23
- octogenarians16
- offensiveness22
- officeholders25
- oligopolistic18
- ontologically19
- operationally18
- ophthalmology27
- optimisations17
- optimizations26
- orchestrating19
- orchestration18
- organogenesis15
- orientational13
- ornamentation15
- ornithologist17
- oropharyngeal22
- orthodontists17
- orthogonality20
- oscilloscopes19
- osteomyelitis18
- outmaneuvered19
- outperforming21
- outspokenness19
- outstandingly18
- overabundance21
- overachievers24
- overachieving25
- overambitious20
- overanalyzing29
- overburdening20
- overconfident22
- overdeveloped23
- overemotional18
- overemphasize32
- overestimated19
- overestimates18
- overextending25
- overextension23
- overindulging19
- overpopulated21
- overprotected21
- overqualified29
- overreactions18
- oversaturated17
- oversensitive19
- overshadowing24
- overstatement18
- overstretched22
- overtreatment18
- overvaluation19
- overwintering20
- oystercatcher23
- paediatrician18
- painstakingly23
- paleomagnetic20
- paradoxically28
- parainfluenza27
- parallelogram18
- parameterized27
- paraphernalia20
- parenthetical20
- participative22
- particleboard20
- particularism19
- particularity20
- passionflower21
- patentability20
- paterfamilias20
- paternalistic17
- pathogenicity24
- patriotically20
- peculiarities17
- pedagogically23
- pediatricians18
- pentobarbital19
- peptidoglycan24
- percussionist17
- perfectionism22
- perfectionist20
- periodization25
- personalising16
- personalizing25
- perspicacious21
- perturbations17
- pervasiveness21
- petrification20
- petrochemical24
- pharmacognosy26
- pharmacologic25
- pharmacopoeia24
- phencyclidine26
- phenobarbital22
- phenomenology24
- phenylalanine21
- phenylephrine26
- phospholipase25
- phospholipids26
- phosphorylase26
Other word lengths
13-letter words starting with
13-letter words ending in
More word tools
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Unscramble & anagram
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- Text Twist Solver All the answers for a Text Twist round, grouped by length.
Word lists & patterns
- Words Starting With Words that begin with any letters you choose.
- Words Ending With Words that finish with a given suffix.
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- Words by Length Lists of 2- to 15-letter words.
- Advanced Word Finder Combine length, prefix, suffix and excluded letters.
Puzzle & game solvers
- Wordle Solver Enter your greens, yellows and greys; get ranked guesses.
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- Crossword Solver Fill gaps like C?O?S with every matching word.
- Hangman Solver The best next letter for a partly revealed word.
- Boggle & Word Search Solver Find every word hidden in a letter grid.
- Strands Helper Trace valid words through a Strands-style grid.
- Wordscapes Helper Every word from a Wordscapes or Word Cookies wheel.
Word reference & utilities
- Word Checker Check whether a word is valid in word games.
- Word Scorer Tile points for any word.
- Rhyming Words Words that sound alike, from real pronunciations.
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- Word Ladder Solver The shortest path from one word to another.
- Letter Frequency Counter Count how often each letter appears in a text.
- Palindrome Finder Words that read the same forwards and backwards.