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.
gramp grampa cramp grump crampy grumpy crimp crump crimpy
ramp cramp gramp tramp preamp warmup grump tromp trampy primp crampy grampa crimp frump rump romp trump crump shrimp
gram grama gramma gramme cram crambe crambo gorm gremmie gremmy grim grime grimy grum grume