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