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.
gastrea gastraea gaster caster castor coaster gustier quaestor gazetteer costar coster keester keister keyster kiester quester questor
gastrea sutra sistra ristra posture pasture osetra lustre astray store straw stray strew stria stere austere stare bestrew bistre estray vesture gesture gastraea lustra moisture ossetra piastre restore rostra wastrie