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.
grubs grabs garbs krubis grebes crabs carbs cribs curbs kerbs carbos carobs carboys caribes corbies carabaos caribous
rubs shrubs grubs cherubs drubs grabs herbs carbos carbs crabs mihrabs garbs burbs barbs kerbs barbes urbs drabs forbs verbs airbus rubus curbs turbos sorbs arbs dribs darbs krubis orbs carobs ribs robs rubes rebs cribs yerbas
grub grubby garb grab grabby grebe krubi