13-letter words
There are 7,827 thirteen-letter words in our dictionary. The most common are PHOSPHORYLATE, PHOTOCHEMICAL, PHOTODETECTOR, PHOTOELECTRIC and PHOTOELECTRON.
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
- phosphorylate26
- photochemical27
- photodetector21
- photoelectric22
- photoelectron20
- photoemission20
- photoreceptor22
- photovoltaics23
- phrenological21
- physiographic29
- physiologists22
- physiotherapy29
- physostigmine24
- phytochemical30
- phytoplankton27
- picturesquely29
- piezoelectric28
- planetesimals17
- pluralization24
- pneumatically22
- pointlessness15
- polarizations24
- policyholders24
- poliomyelitis20
- polybutadiene21
- polycarbonate22
- polychromatic27
- polymorphisms27
- polypropylene25
- polyurethanes21
- pontificating21
- pornographers21
- postgraduates17
- postmodernism20
- postmodernist18
- postoperative20
- postponements19
- postsecondary21
- posttraumatic19
- potentiometer17
- powerlessness18
- pragmatically23
- preadolescent18
- precautionary20
- precipitating20
- precipitously22
- preconception21
- preconditions18
- predilections18
- predominately21
- predominating19
- prefabricated23
- preindustrial16
- preliminaries17
- preliminarily20
- premeditation18
- premenopausal19
- preoccupation21
- preponderance20
- prepositional17
- prepossessing18
- preprocessing20
- preproduction20
- preprogrammed23
- prerequisites24
- preservatives21
- presumptively25
- pretentiously18
- preternatural15
- prevarication20
- primatologist18
- primogeniture18
- principalship24
- probabilistic21
- problematical21
- proclamations19
- procrastinate17
- professorship23
- proficiencies22
- progressivism21
- prohibitively26
- projectionist24
- proliferating19
- proliferative21
- promiscuously22
- pronounceable19
- pronouncement19
- propagandists19
- propagandized29
- prophetically25
- prophylactics27
- proportioning18
- propositional17
- propositioned18
- proscriptions19
- prosecutorial17
- proselytising19
- proselytizing28
- prospectively25
- prostaglandin17
- prostatectomy22
- protectionism19
- protectionist17
- protectorates17
- proteinaceous17
- proteoglycans21
- protestations15
- protuberances19
- provincialism22
- provisionally21
- provocatively26
- pseudoscience20
- psychoanalyst26
- psychoanalyze35
- psychobiology29
- psychodynamic31
- psychohistory29
- psychokinesis27
- psychokinetic29
- psychometrics27
- psychophysics33
- psychosomatic27
- psychosurgery27
- psychotically28
- pusillanimous17
- pyrophosphate28
- quadrilateral23
- quadriplegics28
- qualitatively28
- radioactively22
- radioactivity22
- radioisotopes16
- radionuclides17
- randomization25
- rapprochement24
- ratifications18
- rationalising14
- rationalistic15
- rationalizing23
- reactionaries15
- readjustments23
- reaffirmation21
- reapplication19
- reappointment19
- rearrangement16
- reassessments15
- reassignments16
- reauthorizing26
- recalcitrance19
- recalculating18
- recalculation17
- recalibrating18
- recalibration17
- recapitalized27
- recapitulated18
- recapitulates17
- receptionists17
- receptiveness20
- reciprocating20
- reciprocation19
- recirculating18
- recirculation17
- reclassifying22
- recombination19
- recommendable22
- recomposition19
- reconditioned17
- reconfiguring20
- reconsidering17
- reconstituted16
- recrimination17
- rectification20
- redescription18
- rediscovering20
- redistributed17
- redistributes16
- redistricting17
- reduplication18
- reengineering15
- reestablished19
- reexamination22
- reforestation16
- reformulating19
- reformulation18
- refractometer20
- refrigerating18
- refrigerators17
- regenerations14
- regimentation16
- regurgitating16
- regurgitation15
- rehabilitated19
- rehabilitates18
- reincarnating16
- reincorporate17
- reinstatement15
- reintegrating15
- reintegration14
- reinterpreted16
- reintroducing17
- reinvestigate17
- reinvigorated18
- religiousness14
- relinquishing26
- reminiscences19
- remonstrating16
- remorselessly18
- renegotiating15
- renegotiation14
- reorientation13
- repatriations15
- repeatability20
- replenishment20
- replicability22
- repositioning16
- repossessions15
- reprehensible20
- representable17
- reproductions18
- reprogramming21
- republicanism21
- republication19
- requisitioned23
- restauranteur13
- restaurateurs13
- restrictively21
- resurrections15
- resuscitating16
- resuscitation15
- retransmitted16
- retrenchments20
- retroactively21
- retroactivity21
- retrogression14
- retrogressive17
- retrospection17
- reupholstered19
- reverberating19
- reverberation18
- reverentially19
- reversibility21
- revolutionise16
- revolutionist16
- revolutionize25
- rhododendrons19
- romanticising18
- romanticizing27
- rubbernecking24
- saccharomyces27
- sadomasochism23
- salmonellosis15
- sanctimonious17
- sarcastically20
- satisfactions18
- scarification20
- schadenfreude23
- schematically25
- scholasticism22
- schoolmasters20
- schoolteacher23
- scintillating16
- scintillation15
- scintillators15
- screenwriters18
- scriptwriters20
- seaworthiness19
- secessionists15
- secretaryship23
- sedimentation16
- sedimentology20
- seductiveness19
- seismological18
- seismologists16
- semiautomatic19
- semiclassical19
- semifinalists18
- semipermeable21
- sensationally16
- senselessness13
- sensitisation13
- sensitiveness16
- sensitivities16
- sensitization22
- sensorineural13
- sentimentally18
- sequestration22
- serendipitous16
- serialization22
- sexualization29
- shamelessness18
- sharecroppers22
- sharecropping23
- sharpshooters21
- sharpshooting22
- shortchanging23
- sigmoidoscopy24
- signification19
- singularities14
- situationally16
- skateboarders20
Other word lengths
13-letter words starting with
13-letter words ending in
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