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.
outre outer outthrew outrow outthrow oater odour ottar otter odor
outre tyre metre muter tire tore litre trey true tree stare store stourie satire sutra retore tauter pouter touter outer shoetree neuter dure feature stere mature mitre goitre cuter quatre couter future couture souter stoure attire router strew retire suture tare titre nitre tutor nature shouter