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.
gammas gamas gummas gamays gambas gams gambias gambs gaums camas games camass commas gambes caeomas gummose gummous cammies cams gums cames kames comas camos cameos camise gombos gumbos camisa commies cumbias goombahs goombays
commas shammas gummas summas mommas lemmas gammas mammas mas bemas hyphemias amass femmes gimmes comas mems rumbas ammos dumas hommos mums lamias limas pneumas lamas amias amas pimas mambas amahs lumas mumms gambas hummus nemas somas shammes shamas wammus gamas mamas masa zymase simas omasa mays maes mass moas biomass cymas gamays sambas moms camas loumas pumas caeomas limbas bimahs camass llamas emmys bimas zamias doumas nomas maws shammos
gammy gamma gam agama cammie gama gamay gamb gamba gambe gambia gamey gamy gaum gumma gummy game ogam