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.
moons mons monas muons moans monos monies moneys muns mans manes means manus manos mains minis mines mense manas hymns mensa miens munis mynas manse menus minas minus mynahs hymens mensae manias mannas meanies meinies menisci minnies minnows monoecy mannose meanness
boons coons poons goons zoons noons loons toons moons ons joins sonsy peons coins conns fons aeons gowns sons koans nones eons pons mons monos donsy owns ions wons phonos foins neons leones cons muons phones noose peones donas tauons nouns tons hones loans loins hons scions zones ones jones bones bonus knowns lions cones nonas pones conus onus monas phons paeons johns cions fohns kaons moans onos roans hysons sones pions dons downs tones quoins tonus towns yonis
moon moony mon moan money monie mono mony mown muon