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.
pumas pimas pams poms poems pomes pomos pomace pumice pommies
loumas lumas pumas doumas dumas pneumas mas biomass lums amias camass mambas pimas zymase moas mumms fumes limas llamas kumys masa mass gaums lamias maws summas shamas dumbs doums geums nomas sums cymas heaumes simas bimas rumbas neumes gums mumus caeomas humus limbas mays camas nemas lemmas omasa mammas mommas gambas mums maes bums bemas neums hums hyphemias numbs gamays mamas lamas gummas sambas koumis amass amahs gamas commas comas gammas somas rums sumos zamias bimahs amas koumys chums shammas