17 letter words
COUNTERAGGRESSION​21
IMMUNOSUPPRESSION​25
NEUROTRANSMISSION​19
16 letter words
MISCOMPREHENSION​27
NONCOMPREHENSION​25
15 letter words (10 words)
IMMUNODIFFUSION​26
MISAPPREHENSION​24
INCOMPREHENSION​24
INTERCONVERSION​20
AUTOTRANSFUSION​18
CIRCUMINCESSION​23
CIRCUMINSESSION​21
COUNTERINVASION​20
MICROAGGRESSION​21
POSTTRANSFUSION​20
14 letter words (12 words)
RETRANSMISSION​16
SEROCONVERSION​19
HYPEREXTENSION​29
UNCIRCUMCISION​22
INTERDIFFUSION​21
ANTIAGGRESSION​16
ANTIDEPRESSION​17
ANTISUBVERSION​19
INAPPREHENSION​21
OVERPERSUASION​19
POSTDEPRESSION​19
ULTRAPRECISION​18
13 letter words (30 words)
COMPREHENSION​22
DECOMPRESSION​20
TRANSGRESSION​14
CONDESCENSION​18
PHOTOEMISSION​20
DISPOSSESSION​16
RECOMPRESSION​19
RETROGRESSION​14
INTROGRESSION​14
SUBCOMMISSION​21
BIOCONVERSION​20
ANTICORROSION​15
ANIMADVERSION​19
ANTICOLLISION​15
ANTIRECESSION​15
CARDIOVERSION​19
DISCOMMISSION​20
INTERSPERSION​15
LATEROVERSION​16
MISIMPRESSION​19
12 letter words (41 words)
TRANSMISSION​14
HYPERTENSION​20
CIRCUMCISION​20
APPREHENSION​19
INTERMISSION​14
INTERCESSION​14
REPOSSESSION​14
RESUBMISSION​16
DERMABRASION​17
INTERSESSION​12
DECOMMISSION​19
EXTRAVERSION​22
MALOCCLUSION​18
INTROVERSION​15
REPERCUSSION​16
REPREHENSION​17
PREADMISSION​17
TRANSVERSION​15
EXTROVERSION​22
SUPERSESSION​14
11 letter words (32 words)
COMPRESSION​17
SUPERVISION​16
SUBDIVISION​17
PROGRESSION​14
SUPPRESSION​15
TRANSFUSION​14
HYPOTENSION​19
CABLEVISION​18
READMISSION​14
IMPRECISION​17
DISILLUSION​12
MANUMISSION​15
AMBIVERSION​18
ANTEVERSION​14
COEXTENSION​20
DEACCESSION​16
INEXTENSION​18
INTERFUSION​14
IRREMISSION​13
MISDIVISION​17
10 letter words (68 words)
DISCUSSION​13
COMMISSION​16
TELEVISION​13
PERMISSION​14
EXPRESSION​19
CONVERSION​15
SUBMISSION​14
CONCLUSION​14
DEPRESSION​13
SUSPENSION​12
PROFESSION​15
POSSESSION​12
IMPRESSION​14
REGRESSION​11
PERCUSSION​14
COMPASSION​16
SUCCESSION​14
DISPERSION​13
AGGRESSION​12
SUBVERSION​15
9 letter words (69 words)
EXTENSION​16
PROVISION​14
EXPANSION​18
ADMISSION​12
PRECISION​13
DIMENSION​12
INCLUSION​11
CONFUSION​14
EXPLOSION​18
EXCLUSION​18
ACCESSION​13
COLLISION​11
DIFFUSION​16
CORROSION​11
INTRUSION​9
OBSESSION​11
DIVERSION​13
EXCURSION​18
IMMERSION​13
ASCENSION​11
8 letter words (37 words)
DECISION​11
DIVISION​12
REVISION​11
OCCASION​12
EMISSION​10
INVASION​11
ILLUSION​8
INFUSION​11
OMISSION​10
ADHESION​12
COHESION​13
ENVISION​11
EMULSION​10
ABRASION​10
AVERSION​11
INCISION​10
DELUSION​9
EXCISION​17
EFFUSION​14
ALLUSION​8
7 letter words (21 words)
VERSION​10
SESSION​7
MISSION​9
PENSION​9
PASSION​9
TENSION​7
EROSION​7
MANSION​9
EVASION​10
FISSION​10
TORSION​7
CESSION​9
PULSION​9
ELISION​7
SUASION​7
ABUSION​9
ELUSION​7
ERASION​7
MERSION​9
PLOSION​9
6 letter words (5 words)
VISION​9
FUSION​9
LESION​6
BASION​8
NASION​6
5 letter words
PSION​7