Here's what rhymes with siff.
if stiff def sniff skiff whiff riff tiff cliff midriff hieroglyph Words that almost rhyme with siff
is his this fish viz sieve hiss sis scythe hes fizz shes with give wish miss myth bis dish kiss dis diss pith smith pis piss swish writhed biz kith rive whiz writhe forgive abyss bliss amiss quiz dismiss therewith herewith outlive relive remiss forthwith wherewith premiss jellyfish chandeliers monolith reminisce cuttlefish silversmith corroborative lymph nymph