9 letters
- nonformal18
- nonlethal15
- nonlineal14
- nonmanual17
- nonmental16
- nonracial15
- nonsexual20
- nonsocial15
- nonverbal19
- nonvisual17
- numerical18
- occipital19
- octagonal16
- officinal20
- orificial16
- overpedal18
- oviductal19
- palpebral20
- pansexual22
- paradisal14
- paralegal16
- parochial18
- passional14
- penumbral21
- perennial15
- perinatal14
- perpetual17
- petechial18
- pictorial16
- piecemeal19
- piperonal17
- piratical16
- placental18
- polemical20
- political17
- polygonal19
- polytonal17
- popliteal17
- portrayal15
- postaxial20
- postcaval20
- postnatal14
- posttrial13
- potential14
- practical19
- prebendal18
- precocial19
- precoital16
- prefeudal18
- preputial17
- presidial14
- preverbal20
- primatial16
- principal20
- prodromal17
- protozoal22
- psychical23
- puerperal17
- pycnidial20
- pyramidal19
- pyridoxal23
- quizzical41
- raptorial13
- rearousal11
- rectorial13
- regicidal16
- rehearsal12
- reprieval17
- retrieval14
- revictual18
- rhizobial24
- rhizoidal22
- ribosomal16
- sartorial10
- satirical13
- sceptical19
- sciential14
- sectional14
- sectorial13
- segmental16
- semestral13
- semifinal17
- semimetal16
- semirural14
- semitonal14
- seneschal16
- sensorial11
- serotinal11
- sessional11
- sigmoidal16
- sinistral11
- skeptical20
- spherical18
- spiritual14
- squamosal23
- stapedial14
- stational11
- steroidal11
- stomodeal14
- subaerial14
- subapical20
- subdermal18
- sublethal17
- submittal17
- subnormal18
- subsocial17
- subvassal18
- subvisual19
- suctional15
- suctorial14
- superreal14
- surficial17
- surprisal14
- sympodial19
- synagogal17
- synclinal18
- syncytial18
- synodical17
- technical19
- tegmental16
- tensional12
- theriacal15
- thesaural13
- thyroidal15
- tonsorial11
- torsional11
- traversal14
- trichinal16
- triennial12
- trihedral13
- trinomial14
- triumphal19
- tuitional12
- umbilical21
- uncynical21
- unethical17
- unilineal14
- unisexual20
- universal16
- unlyrical18
- unmusical19
- unnatural14
- untypical20
- uredinial13
- vaccinial21
- vasovagal20
- vaticinal18
- vectorial17
- veridical18
- versional15
- vertebral17
- vestigial16
- vicennial19
- viceregal19
- vigesimal19
- viricidal18
- virucidal19
- vizierial23
- whimsical21