Here's what rhymes with ternary.
marry merry nary very vary fairy bury dairy ferry wary cherry hairy honorary berry sherry tarry parry harry tare barre terry faerie wherry urinary prairie scary canary remarry unwary pessary ordinary temporary monetary dietary adversary sanitary ancillary budgetary mercenary planetary commissary emissary itinerary statuary aviary buffoonery legionary apiary dromedary equerry humeri bilberry elderberry topiary nondairy plagiary necessary military literary customary missionary pulmonary capillary commentary coronary dictionary imaginary monastery sanctuary solitary stationary cemetery legendary unitary visionary dysentery estuary sedentary seminary veterinary apothecary funerary mortuary obituary papillary savagery stationery cautionary centenary dignitary luminary bacillary beriberi breviary diversionary actuary cassowary lapidary chokecherry sectary secondary arbitrary hereditary judiciary maxillary momentary pecuniary pituitary reactionary corollary salutary culinary fiduciary functionary sanguinary supernumerary tutelary unsanitary insanitary huckleberry tercentenary contemporary secretary preliminary unnecessary subsidiary beneficiary disciplinary fragmentary involuntary tributary deflationary epistolary expansionary probationary recessionary voluptuary bicentenary nonliterary uncustomary evolutionary vocabulary proprietary discretionary inflationary genitourinary interplanetary paramilitary nonmilitary concessionary eleemosynary geostationary extraordinary revolutionary exclusionary confectionery expeditionary constabulary undersecretary elocutionary nonhereditary interdisciplinary noninflationary cardiopulmonary multidisciplinary counterrevolutionary Words that almost rhyme with ternary
belly jelly smelly deli telly allele underbelly vermicelli many messy heavy ready fairly rarely barely semi petty levy penny heady levee medley jetty teddy bevy faery jenny kepi leggy recce sedgy veggie healthy steady wealthy deadly lengthy gentry fleshy antennae carefree sentry sexy sketchy sweaty unfairly vestry belfry deathly gayety hefty machete pebbly tempi testy breathy dressy pesky thready lefty wetly already directly twenty scarcely gently plenty freshly immensely unhealthy densely frenzy squarely deftly spaghetti unsteady coquetry fleshly halfpenny stealthy sullenly confetti fidgety hostelry tensely trendy maidenly marquetry effendi ineptly especially assembly friendly correctly elementary intensely epilepsy intently aplenty baronetcy catalepsy deviancy libretti adeptly preciously woodenly indirectly incorrectly unfriendly apoplexy excellency sacredly cognoscenti penitently complementary expressly grotesquely complexly narcolepsy reassembly confusedly circumspectly ambivalently equivalently