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.
knobbly nobbily nobly nobble nubbly noble nebuly nibble nubble nebula nebule nubile nebulae
knobbly wobbly chubbily bubbly hobble hubbly cobble gobble nobbily nobly bobble nubbly pebbly rubbly doubly wabbly wobble nobble shabbily
knobby knob knubby nobby snobby nob