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