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.
sprain soprani soprano sporran spurn sapphirine cyprian
sprain apiarian sporran soprani cyprian piperine papyrine papyrian leporine caprine heparin parian pyran pirana purine purin purana prion prawn riparian sapphirine soprano viperine
spray spirea supra spurrey spur spry sprue spree spore spiry spire spar spiraea spear sparry sparrow spare spurry osprey