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.
tags taigas tegs tugs dags togs takas togas teaks tacks teggs tacos takes dagos daggas tikkas togues teguas tokays dagoes tax dugs dogs taxi tics taxa digs daks dawks degas ticks tikes tikis tokes tucks tykes
ags mags shags tags dags zags sags rags peags nags lags bags quags gags jags hags fags wags yags