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.
atoner attainer
toner stoner atoner ratooner buttoner rottener tinier tinnier tonier tuner tawnier downer teener denier mutineer attainer lateener rattener fattener stunner detainer widener tonner downier deanery dunner donor dinner dinero diner tinner teenier tenner tannery quietener battener retainer stainer tanner stonier deadener whitener woodener