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.
weird weirdo weirdy weirdie wired waired ward wearied whirred word wert whirried wherried wared wordy warred whored whereat whereto worried wart wort
weird haired heard herd oreide perdy peered sered mired nerdy liard tired deaired waired laired quired weirdo jeered wired caird cheered ired choreoid hired sheered irid yaird heired aired beard leered fired veered fiord paired cered perdu sired nerd nereid merde ureide tiered virid hairdo laird weirdy jerid chaired queered choired bird shaird faired sherd gird yird
weir wair wear weary weer were where wherry whir whirr whirry wire wirra wiry ewer