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.
jammier jammer gemmier jamboree
gemmier rummier gammier chummier yummier jammier gummier rammier hammier limbier hemmer emmer homier limmer mummer cummer rammer fumier shammer dammer wommera simmer summery dimmer wombier seamier doomier yammer rimier rimmer hummer loamier gummer lambier foamier limier beamier gamier bummer roomier gambier shimmer rummer hammer summer mummery gammer jammer mammer boomier mimer shimmery mir