Here's what rhymes with happytime.
time dime beim chime chyme prime lime rhyme hym rime mime thyme suppertime crime climb anytime clime slime grime summertime birdlime paradigm sublime overtime onetime dinnertime begrime mistime maritime pantomime wintertime lysozyme mesenchyme flexitime Words that almost rhyme with happytime
pine dine tine line fine nine sign mine wine shine spine thine sine vine brine sein twine whine heing opine stein zine design divine define assign benign shrine iodine align supine swine atropine serpentine affine anodyne aline sauteing anteing decline dopamine resign undermine refine turpentine cysteine palatine pyridine redefine redesign underline hyperfine malign proline saccharine thymine asinine entwine realign reassign superfine valentine cosign alkaline confine borderline incline thiamine centerline consign monoamine anticline enshrine recline recombine waterline byzantine calamine columbine intertwine timberline interline celandine endocrine epinephrine concubine imipramine porcupine eglantine reconsign crystalline exocrine crinoline disincline clementine lacustrine norepinephrine tetracycline neuroendocrine polycrystalline noncrystalline