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.
somas soms simas sambas summas sums sims zooms cymas seems sumos smaze seams semes smews semis sambos samosa zamias zombis zymase simious zombies
caeomas somas comas nomas oms mas comes roams omasa gamays mammas looms mamas camas amias limbas nomes homes amass biomass roms amahs limas commas hyphemias poms ohms pumas summas shamas whomso tomes duomos doums dooms domes zooms sambas mommas coombs biomes rumbas llamas booms pomos bimahs homos noms poems pomes foams bemas camass moas loams nemas moms lamas amas mays combs pimas loumas momus cymas masa lamias maws gambas lumas simas gamas gnomes gummas maes bimas pneumas lemmas mass bombs nomos momes rooms gammas soms mambas zamias zymase doms doumas dumas tombs toms wombs shammas