I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
lupines lupins lapins lipins lippiness loopiness lippens
lupines rapines chopines spines supines opines repines pines pins pians apneas lapins depones hypopneas peins loopiness pepinos dopiness pions jeepneys pipiness ropiness soppiness hipness penes deepness tiepins pinas chopins cheapness nippiness mopiness sapiens nappiness panes pippins papains pains happiness lupins lippiness spins repins dippiness lipins hippiness cioppinos soapiness sappiness pones peppiness weepiness eupneas choppiness
lupin lupine lapin lipin alpine