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.
gamble gambol gamely gamily cambial gumball gumboil camel camail kamala camelia camellia
bumble rumble gamble wamble fimble mumble amble shamble wimble jumble ramble tumble fumble humble nimble mole mile amole tamale numbly jumbal timbale chimbley gimbal dumbly gambol wambly cymbal chimley umbel simile gemmule male female symbol rumbly timbal mule rambla chimbly sambal mumbly smile tymbal humbly nimbly tombal
gamb gambia gamba gambe gam gamey agama cambia gama gamay gamy gamma game gaum gombo gumbo gammy ogam