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.
moreen morn moron mourn morion murein moraine morrion mirin marina marine maroon marron murine murrain murrine
boreen careen treen preen moreen green terreen tureen rein pereon greeny siren warren hereon serein terrene whereon barren arene herein bren murein wherein frena serene pyrene arena wren gyrene syren chirren
more mor mare mere mire moira moirai moire moor moory mora morae moray morro morrow mure