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.
gabber gabbier gabbro caber cobber goober cobbier cuber kabar cowberry
bobber dobber dabber lobber gabber libber fabber mobber bibber robber hobber jibber gibber yabber dubber jobber cobber rubber dibber jabber sobber lubber tubber nabber fibber ribber suber sober knobbier bobbery nobbier cobbier gabbier fiber saber liber beer bier rubier tuber weber gabbro robbery shabbier daubier jobbery knubbier ribier giber bear nubbier caber rubbery daubery taber dauber cyber bibbery jiber ribbier cuber goober chubbier tubbier babier webbier