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.
gumbos gombos gums gummous gummose gaums gambs gambes combos gambas gummas cumbias gambias gams goombays goombahs camos gamas combs games kumys cameos combes comose coombs gamays gammas kombus koumis koumys kumiss coombes koumiss koumyss
bimbos gumbos umbos combos limbos gombos sambos dumbos jumbos mambos ambos mos kombus moss moos coombs bimboes haymows bombes hommos ramous gummose coombes bamboos memos rumbas awmous limbus romeos nomos zombis sumos shamoys shamois chymous chemos wombs duomos moas daimios gambas tombs jambes moms rimous lambs jambs combes comous ramose emboss limbas iambs gambes demos mimeos rimose gambs gummous mamboes vamose mimosa iambus cymous ammos camos comose combs sambas samosa mows pomos numbs cameos cymose famous limbs embows limos mambas homos dumbs tomboys nimbus bombs chamois chimbs shammos shamos shmoes
gumbo gum cumbia gamb gamba gambe gambia gaum gombo gumma gummy