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.
mugs muggs megs mags mogs migs muggees mucus magus miggs mucks mucous megass maquis mucose mucosa mucosae magueys megasse moggies mics mocs macs mycs micas micks mikes mocks mokes macks makes makos
bugs fugs vugs hugs jugs lugs mugs pugs rugs dugs tugs chugs