Here's what rhymes with copyin.
been sin thin win min tin chin kin pin twin bin din fin gin lin syn yin cine hin kine shin vin jinn djinn begin skin spin akin grin sayin tryin quin condign within therein wherein herein journeymen porcine underpin bearskin bogeymen pinyin shebeen boogeymen violin chagrin mandolin Words that almost rhyme with copyin
him bring thing king ring sing wing dim limb rim hymn trim brim gym meme whim ling ning ping ting tyme wring ching ding ming prim sim vim bling shim limn zing spring string grim swim swing cling slim fling sling sting skim mewling sporing gawping sousing moussing anything upswing antonym scrim prelim queering scything rousting everything pseudonym kibbutzim quicklime texting huzzahing dybbukim synonym kiln villein