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.
denar denary denari denarii dinar denier deanery donor diner tenor tenner tenour dinero dinner teener dunner downer tenure downier teenier
denar henry unary teener denary binary sonar senor hymnary linear quinary kinara keener canary genro genre gnar gnarr anear near nary knaur knar lunar senary snare zonary denari dinar tenor wiener
den dean dene deni deny diene dona duenna etna deaden detain detainee