8 letters
- iatrical12
- iconical16
- illuvial16
- imaginal15
- immortal15
- imperial15
- inchmeal18
- indusial12
- inertial10
- infaunal15
- infernal14
- informal16
- infrugal16
- inguinal14
- inimical16
- integral12
- internal11
- interval14
- irenical13
- ironical13
- isogonal12
- judicial23
- kathodal16
- keloidal15
- khedival20
- lacrimal16
- lagoonal13
- laryngal15
- lipoidal14
- littoral10
- lixivial21
- locustal14
- loessial10
- lubrical17
- macrural16
- madrigal15
- malarial13
- maniacal16
- manorial13
- manurial14
- marginal15
- material12
- maternal13
- matronal13
- medieval17
- megadeal15
- memorial15
- meniscal16
- mensural14
- metazoal21
- methylal17
- metrical15
- milligal16
- minutial14
- mistrial12
- monachal18
- monaural14
- monaxial20
- monomial16
- morainal13
- motional13
- mucoidal17
- mycelial18
- mystical17
- mythical19
- national11
- nauplial15
- nautical14
- neonatal11
- neuronal12
- neurosal11
- nonequal21
- nonfatal14
- nonfinal15
- nonfocal17
- nonideal12
- nonlegal14
- nonlocal15
- nonmetal14
- nonmodal15
- nonmoral14
- nonnaval16
- nonpapal17
- nonrival15
- nonroyal13
- nonrural12
- nontidal12
- nontonal12
- nonviral15
- nonvocal18
- notarial10
- notional11
- noumenal15
- novercal17
- nurtural12
- occlusal17
- octantal13
- official18
- oogonial12
- oothecal14
- optional13
- oriental10
- original12
- orinasal10
- orphical17
- outrival14
- overzeal22
- ovicidal17
- oviducal18
- palatial13
- parental13
- parfocal18
- parietal12
- pastoral12
- pastural13
- patagial14
- paternal13
- patronal13
- pectoral15
- pedestal13
- pelagial15
- pelletal14
- peridial13
- perigeal14
- perineal13
- peroneal13
- personal13
- petrosal12
- phratral14
- physical19
- piscinal16
- plastral13
- podagral15
- poetical15
- pollical17
- postanal13
- postoral12
- postural13
- praedial13
- prandial14
- preaxial19
- prebasal15
- precaval19
- prefixal22
- prelegal15
- premoral15
- prenatal13
- prepupal19
- prerenal13
- pretrial12
- primatal15
- primeval19
- procural16
- prodigal15
- proemial15
- proposal15
- prosomal15
- proviral16
- proximal22
- pubertal16
- pudendal16
- pulpital17
- punctual18
- puparial16
- pygidial17
- pyrexial21
- rasorial9
- rational10
- reburial13
- rebuttal13
- referral12
- regental12
- regional12
- remedial13
- remigial14
- remittal12
- reprisal12
- reproval16
- requital19
- residual11
- restoral9
- revenual15
- reversal13
- reviewal16
- rhonchal17
- rubrical16
- rustical13
- sagittal11
- scenical16
- sceptral15
- seasonal10
- sectoral12
- selfheal15
- septical15
- shogunal15
- shrieval15
- sidereal10
- silvical17
- siphonal15
- skeletal14