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