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.
shroud shred sherd shard shared shored shaird shrewd sheared sheroot sheered choroid shirred shrewdie choreoid chorioid short chard shirt chord shirty chored shorty chared chirred charred cheered choired churred shortie chariot chaired charade cheroot
proud shroud rod crud road rude rudd rout rood neuroid rode corody fraud rued grout broad sarod sciuroid droid hydroid trod trout choroid gourd corrody viroid brood joyrode corrode crowd crude erode grody parody maraud period aroid prude sarode zeroed druid toroid trode trued prod byroad
share sharia shariah sherry shire shirr shoer shore shrew shri ashore