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.
migs miggs mics mugs mags mogs megs magus micas micks mikes muggs maquis megass mix muggees mickeys magueys moggies megasse macs mocs maxi mycs macks makes makos mocks mokes moxie mucks mucus
bigs figs vigs gigs jigs migs pigs rigs cigs zigs digs whigs wigs