Here's what rhymes with londonderry.
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belly jelly deli telly underbelly allele smelly 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 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 confetti fidgety tensely trendy maidenly thready lefty wetly already directly scarcely intensely freshly frenzy intently squarely spaghetti coquetry fleshly halfpenny hostelry aplenty libretti marquetry adeptly effendi preciously woodenly assembly friendly correctly elementary indirectly complementary epilepsy immensely unfriendly apoplexy sullenly complexly baronetcy deviancy ineptly penitently expressly incorrectly excellency grotesquely sacredly catalepsy confusedly narcolepsy ambivalently circumspectly cognoscenti reassembly equivalently