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