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.
pastie paste postie past piste pasta pasty pst passed paused passade psst pest post posit pseud pesto posed paced pesty poussette posset poised peaced peised pistou pissed pieced pseudo pesade passado paucity piosity hypoacid
beastie pastie postie testee xystoi daisied cesti seaside paste moste reside lysate vestee taste wayside mustee busied mestee haste listee gussied cosied caste hessite piste fossate quayside sate fissate stey side baste costae coesite geste sati misate site aside beside stew resite cestoi xysti zoisite dayside testae waste chaste
pas paws spas paps pias pease peas pays pause paisa passee passe pass paseo pase paise upas