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.
macros micros makars makers mucors mockers muckers muggars mockeries muggers muggurs
macros micros cars guiros karoos kaross karroos kouros grows acres agarose buckaroos fiacres buckeroos vigorous cors nacres picaros recurs rigorous saguaros soucars squarrose sucrose decors vicars jackeroos curs across lycras curios gross lucres jackaroos vigoroso crus ecrus vaqueros buckayros aggros cris cross crows mucors necrose recross regrows rockrose scars sowcars sucres decorous checkrows
macro micra micro mucro smacker