Here's what rhymes with costomary.
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belly allele jelly smelly deli telly underbelly vermicelli many messy heavy ready fairly rarely barely semi petty levy penny antennae heady levee medley spaghetti unfairly jetty teddy bevy faery jenny kepi leggy recce sedgy veggie healthy steady wealthy deadly lengthy gentry unhealthy fleshy carefree sentry sexy sketchy sweaty unsteady vestry belfry deathly gayety hefty machete confetti pebbly tempi testy breathy dressy pesky thready lefty wetly already directly especially twenty assembly scarcely elementary gently plenty complementary epilepsy freshly immensely densely frenzy squarely deftly coquetry fleshly halfpenny stealthy sullenly fidgety hostelry tensely trendy aplenty baronetcy libretti maidenly marquetry adeptly effendi ineptly friendly correctly intensely intently unfriendly apoplexy sacredly catalepsy deviancy preciously woodenly indirectly expressly incorrectly excellency complexly narcolepsy cognoscenti reassembly penitently confusedly grotesquely circumspectly equivalently ambivalently