13 letters
- leishmaniases20
- leishmaniasis20
- lightfastness22
- lollapaloozas29
- lowerclassman25
- lowerclassmen25
- lymphoblastic31
- masculinising25
- masculinities22
- masculinizing34
- massivenesses21
- masterfulness22
- masterminding24
- mastersingers19
- masterstrokes20
- masticatories19
- mastigophoran24
- mastoidectomy25
- mastoiditides18
- masturbations21
- materfamilias23
- measurability23
- megaloblastic26
- megasporangia24
- mesotheliomas22
- metasomatisms22
- metastability22
- metastasizing28
- metrorrhagias20
- microcassette22
- microvascular28
- misassembling26
- misassumption24
- misclassified24
- misclassifies23
- misemphasized34
- misemphasizes33
- multiorgasmic26
- multitaskings25
- narrowcasting23
- nasalizations25
- nasopharynges24
- nasopharynxes29
- neoclassicism24
- neoclassicist21
- neoplasticism24
- neoplasticist21
- neuraminidase20
- neurasthenias18
- neurasthenics21
- neuroblastoma22
- neurofibromas24
- nonassociated19
- nonbroadcasts22
- nonclassified23
- nonclassrooms22
- nondecreasing22
- nonincreasing22
- nonmeasurable23
- normothermias22
- northeasterly19
- northeastward20
- nucleoplasmic29
- nucleotidases20
- odontoblastic22
- onomastically24
- onomasticians21
- onomatopoeias20
- orgiastically22
- osteomalacias20
- osteoplasties17
- osteosarcomas19
- overasserting20
- overassertion18
- overassertive21
- overemphasize34
- overmastering23
- pancytopenias26
- paraesthesias18
- paraphrasable25
- parasexuality27
- parasitically23
- parasiticidal21
- parasiticides20
- parasitologic22
- parasyntheses21
- parasynthesis21
- parasynthetic24
- pasqueflowers33
- passementerie20
- passionflower24
- passivenesses21
- paterfamilias23
- penicillinase23
- peppergrasses24
- pervasiveness25
- pharmacopeias27
- phosphaturias24
- phosphokinase28
- phospholipase27
- phosphorylase26
- phragmoplasts27
- phrasemakings28
- phrasemongers24
- phraseologies21
- phraseologist21
- plasmodesmata24
- plasterboards21
- plastocyanins24
- plastoquinone29
- polycythemias29
- postclassical24
- postvasectomy28
- praseodymiums26
- preeclampsias26
- prepurchasing28
- procrastinate20
- prosopopoeias22
- pseudoclassic25
- psychasthenia26
- psychasthenic29
- quadriplegias30
- quartermaster26
- quasicrystals29
- quasiparticle30
- quasiperiodic30
- reasonability20
- reassemblages22
- reassessments17
- reassignments20
- reassumptions21
- reclassifying25
- reemphasizing33
- remeasurement21
- rhinoplasties20
- ribonucleases22
- sadomasochism25
- sadomasochist22
- sarcastically23
- sarsaparillas18
- scholasticate22
- scholasticism25
- schoolmasters22
- sclerenchymas28
- seasicknesses21
- seasonalities15
- semasiologies19
- semiclassical24
- semiparasites19
- semiparasitic22
- southeasterly19
- southeastward20
- spasmodically27
- splashinesses20
- sportscasters19
- sportscasting22
- squashinesses26
- stationmaster17
- steadfastness18
- steeplechaser22
- steeplechases22
- stichomythias25
- stigmasterols19
- streptokinase21
- suasivenesses19
- subassemblies24
- subclassified25
- subclassifies24
- subtreasuries18
- sulfonylureas23
- swashbucklers30
- swashbuckling33
- switchgrasses23
- synaesthesias18
- tastelessness15
- technophobias27
- thalassaemias19
- thalassocracy24
- thalassocrats19
- thermoplastic25
- thrasonically23
- thrombokinase26
- toastmistress16
- toxoplasmoses27
- toxoplasmosis27
- tradescantias18
- transaminases18
- transcriptase20
- treasurership19
- triploblastic24
- trophoblastic25
- unassertively22
- unassimilable23
- unassimilated20
- unassuageable22
- underclassman24
- underclassmen24
- underemphases24
- underemphasis24
- unembarrassed22