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.
pasta past paste pasty pst peseta pastie psst passado post passade pest pesty pesto piste posit paused pistou posada posset postie passed paucity piosity poussette
pasta boast fiesta last mayst maist oast costa cuesta caste pasty beast roast hosta sayst cassata vista taste haste testa vast toast ghast waist vasty waste feast yeast fast east satay cast baste stoa least nasty mast past costae gast coast peseta paste cesta casita seta siesta hast tasty hasty testae staw toasty stay wast vesta chaste bast yeasty
pas paws spas paps pias pease peas pays pause paisa passee passe pass paseo pase paise upas