Here's what rhymes with bifth.
fifth Words that almost rhyme with bifth
ifs riffs whiffs gives lives myths cliffs sieves scythes skiffs sniffs writhes smiths forgives blacksmiths goldsmiths hieroglyphs monoliths silversmiths pith myth width filth plinth scythe writhed writhe sixth smith labyrinth therewith wherewith herewith hyacinth forthwith monolith silversmith