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.
cymas cymes cymose cymous zymase simas somas zymes sambas summas zamias sims soms sums
cymas mas camass maes masa mass gyms mays moas maws llamas limas mambas comas camas nomas lamias gummas omasa gambas pumas gamas rumbas cymes simas summas zymase doumas chymes shammas mommas biomass lumas gammas bimas hyphemias bemas amias bimahs limbas mamas lemmas loumas amas lamas mammas nemas pneumas gamays pimas commas rhymes caeomas amass amahs sambas somas zamias zymes dumas shamas yams