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.
simians saimins somans siemens simoons simonies seaminess semens summons sameness simonize someones symbions zoomanias
simians mans bemeans famines amines moans amins minis minus lemans mines minas gamins remans cummins caymans romans caimans miens mains damans demeans diamins domines tameins womans lomeins manos hemins laminas humans manse homines bemoans haemins manas manes ammines imines manus means limans camions remains gamines romanos cumins saimins somans damianas diamines domains dominos tomans shamans