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.
astir aster astray asteria austere aciduria azoturia
astir bestir stir lustra juster piaster heister baster moister maestri bustier costar vaster quaestor vestry master luster tastier keester toastier zestier mustier diester royster mister sister rester bister rooster pastor jester yeastier chestier waster testier dustier daystar xyster wrester rostra roaster poster pester paster nester fustier wester castor ouster questor keyster gaster leister booster fester bistro feaster bistre ester boaster zootier aster vastier meister ghostier muster nastier caster coster jouster gustier hastier lustre star satire piastre lister faster easter pastier nestor sootier coaster foster maestro feistier raster sautoir hoister stair mistier ristra lustier roster pastry quester keister pestier oyster wristier laster zester buster diaster zoster kiester duster taster rustier tester toaster sistra waister wastry roister chaster shyster rouster yester