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.
memoir memory member mimer maimer mammer mimbar mummer mammary mummery
memoir mir mor rumor seamier remora roomier jammier humour memory gammier amir gummier chummier loamier gamier homier amour fumier femora boomier bemire beamier tumor more gambir moira mora miri emir moor gemmier humor hammier foamier moire mair miry limier mire rammier rimier rummier rumour doomier tumour yummier