Here's what rhymes with spectrometery.
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belly jelly deli telly allele underbelly smelly vermicelli barely petty penny jetty teddy bevy jenny many heavy ready fairly rarely steady semi deadly gentry levy antennae heady levee messy belfry deathly machete 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 stealthy fidgety tensely trendy aplenty libretti maidenly marquetry thready adeptly lefty wetly already directly assembly scarcely freshly unhealthy frenzy squarely apoplexy spaghetti coquetry fleshly halfpenny sullenly confetti hostelry effendi preciously woodenly friendly correctly elementary intensely epilepsy immensely intently deviancy ineptly indirectly complementary expressly incorrectly unfriendly excellency grotesquely complexly narcolepsy sacredly baronetcy catalepsy cognoscenti reassembly penitently circumspectly confusedly equivalently ambivalently