13 letters
- pelletization28
- penicillamine26
- penicillinase23
- penitentially22
- periodontally22
- phallocentric27
- pharisaically25
- philhellenism27
- philhellenist24
- phillumenists25
- pianistically24
- pietistically23
- pneumatically28
- pointillistic22
- polysyllables27
- porcellaneous23
- postcranially24
- pragmatically28
- pralltrillers20
- precancelling28
- precollegiate23
- preenrollment23
- prejudicially34
- premillennial24
- prismatically26
- probationally24
- proleptically27
- prophetically28
- provisionally25
- pseudoalleles21
- psychotically30
- puritanically25
- pusillanimity25
- pusillanimous24
- pyrolytically28
- pyrophyllites27
- quadratically31
- quadrennially30
- quadrillionth29
- quindecillion31
- quintillionth29
- radiolabelled21
- realistically21
- reallocations19
- recallability24
- rechallenging26
- rechannelling25
- recollections22
- recrystallize29
- referentially21
- reportorially20
- reproachfully29
- residentially19
- resourcefully25
- reverentially22
- revictualling26
- rhapsodically26
- rheologically25
- rheumatically26
- sacramentally24
- sacrificially26
- salmonelloses20
- salmonellosis20
- sarcastically23
- sarsaparillas18
- schematically28
- schoolfellows27
- scintillantly23
- scintillating22
- scintillation20
- scintillators19
- semitonically24
- sempiternally24
- sensationally19
- sentimentally22
- serologically23
- sexdecillions27
- shallownesses21
- shellcrackers27
- situationally19
- smallholdings25
- snollygosters20
- sophistically25
- spasmodically27
- splenetically25
- sporopollenin23
- statistically20
- steamrollered19
- stigmatically25
- storytellings20
- strategically22
- stylistically23
- suballocation23
- subclinically29
- subcollection26
- subcollegiate24
- subculturally27
- submillimeter25
- subsatellites19
- substantially22
- supercollider23
- superficially27
- supernormally25
- superthriller21
- surveillances24
- suspensefully26
- sybaritically25
- syllabicating26
- syllabication24
- syllabicities23
- symbiotically28
- symmetallisms26
- symmetrically28
- sympatrically28
- symphonically31
- syntactically26
- synthetically25
- taxonomically31
- tellurometers19
- terrestrially17
- territorially17
- tessellations16
- tetrahedrally20
- theologically25
- theophyllines25
- theoretically22
- thrasonically23
- titillatingly21
- tonsillectomy24
- tonsillitises16
- topologically26
- torticollises18
- tortoiseshell17
- touristically21
- traditionally19
- tranquillized36
- tranquillizer35
- tranquillizes35
- traumatically24
- tredecillions20
- trolleybusses21
- tropocollagen24
- turbellarians20
- typologically28
- umbelliferous26
- unbeautifully27
- unbelligerent23
- unchallenging28
- uncollectible27
- unembellished26
- unemotionally23
- unequivocally36
- unfulfillable29
- unintelligent21
- uniparentally23
- unwillingness24
- vacillatingly28
- valpolicellas27
- valuationally24
- variationally22
- vaudevillians26
- vexillologies29
- vexillologist29
- vigintillions23
- violoncellist24
- virologically27
- wallydraigles24
- whippoorwills29
- willfulnesses24
- willingnesses22
- wollastonites19
- yellowhammers28
- yellowthroats22
- zooxanthellae34