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.
seidel steel sidle sedile steely sedilia seedily steelie stela sadly steal setal stele still cedula settle stelae stelai stella stilly cedilla sootily zooidal
seidel del hyoidal wedel zooidal bedel deil dele deli dell diel duel deal model idle bedell idly idol idyl geoidal nidal rudely ideal nudely sidle tidal widely yodel
said seed seedy side sidh sued suede aside seised seized used