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.
macs macks macaws mics mycs mags mocs mocks micas mucus makos magus makes mucks micks mucose megass maquis mucous max megasse mickeys magueys megs migs mogs moxa maxi mugs miggs mikes mokes muggs
vacs guaiacs lacs macs pacs sacs