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.
could cold coled cloud cauld colead cooled culled coiled cloudy coaled cowled clod clad cullied collied collude cult gold collide colt colloid guild clued culti culet clout yclad clade guiled called collet cloddy gaoled gulled goaled cullet culotte quilled collate gullied quelled quailed claddagh quaalude clot glad gled
mould should would could old fold soldi soled poult ruled gold holed poled aloud fooled woald cloud cloudy wooled hold cauld hauled voled fouled mauled moult shauled souled pooled tooled auld moldy gaoled shooled fauld miauled mold oldy loud build muled mouldy cold told coled bold guild puled sold soldo solid doled toled wauled wold cooled yauld
coulee col oculi aculei cullay coyly cooly coolly coolie cool coly colly cole collie cola coil coaly coala coal caul cowl cull cully coquille scull