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