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.
muggs mugs muggees miggs moggies mogs mags megs migs mucus mucks magus mucose maquis megass mucosa mucous magueys megasse mucosae macs mics mocs mycs
vuggs muggs yeggs tugs dugs rugs pugs mugs lugs gigs miggs quags quaggas gags jugs jaggs hugs eggs hoggs bugs haggis vugs fugus fugs iggs noggs raggs daggas teggs chugs yugas
mugg muggee muggy mug migg moggie moggy smug