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