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.
farrow furrow frow faro furrowy fro far fare fair vrow fear fiar froe vrouw faery furry feuar firry ferry fairy faerie gharri gharry forwhy pharaoh fer fir for fry fur var
arrow barrow furrow marrow narrow morrow yarrow burrow borrow harrow sorrow farrow row karroo churro vrouw trow burro brow morro furrowy barrio arrowy serow marrowy frow prow vrow charro grow crow