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.
films filmis flams flames fleams flimsy flumes flambes foliums fullams flambeaus phloems vellums volumes phellems phyllomes
films almes helms calms haulms glums glims kalams phellems halmas flams qualms kelims millimes elms foliums balms palms alms shaloms realms filmis salmis alums slimes blams climes slimsy solums clams delimes culms whelms glams lams limas plums glimes holms claims heliums golems gloms kaliums vellums halms flimsy malms kilims palliums limbs fullams alliums limos coeloms chillums galliums dolmas climbs xylems slums limes ylems slims lums slams almas celoms sholoms
film filmi filmy filum flam flambe flambeau flambee flame flamy flume