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.
washout watchout washed waucht whisht washday wecht wished watched whished wooshed
beshout shout washout shot shut shoat shoot shote shott shute bowshot pitchout reshoot reshot watchout