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.
pepinos peppiness papains pippins pipiness
pepinos cioppinos pins lupines chopines lipins supines lapins spinous pions spines rapines epinaos papains opines lupins pians pines pianos peins pains pippins repines ripienos pinas repins sapiens spinose spins tiepins chopins