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.
guaranis guaranies guaranas grans grannies grains groans carnies garrons gurneys currans greenies grayness guernsey crannies carns curns grins karns cranes greens cairns groins querns carneys groynes cronies carinas careens carrions greyness goriness greenness queerness kerns kirns corns crones croons crowns kernes kroons
ranis guaranis hernias carnies cranes grains groans guaranies furans byrnies murrains lorans parians prawns pyrans saurians drains terrains trains uranias guaranas furanes burans marranos brawns rains brans brains boranes birianis grans roans burnies currans ornis piranas puranas sarans serranos durians terranes trans shorans