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.
groans grans grains groins groynes garrons grins grannies guaranis grayness guaranas cranes greens guaranies kroons croons crowns crones cronies currans coronas gurneys greyness guernsey goriness carrions crannies greenies kerns carns kirns corns curns karns greenness kernes cairns querns cornus careens carinas carneys carnies corneas korunas corneous
roans groans barns boranes irones herons birianis paranoias rains ranis croons morrions corns cranes barons pereions furans harianas neurones ruanas frowns perrons carns currans borons grains tarns yarns durians sharns warns prions trones trans guaranas terranes reearns morns porns drones marrons sorns diurons karns saurians hyperons pyrans maroons learns browns horns lorans garrons piranas brains earns neurons furanes heroins pereons girons crones crowns murrains irons virions brans parians grans brawns frons gyrons burans coronas carrions groins morons marranos pyrones paranoeas serranos kroons drains darns morions drowns prawns sarans terrains trains guaranis tronas turions puranas chorions shorans durions yearns
groan grain grainy gran grana grannie granny groin grown groyne