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.
kitties kites kits cutties kiddies catties kytes gaieties cuties cooties kiddoes kids kats cutes cates gaits kadis cutis keets katas quits kotos gates cotes guides kiddos cutesy kotows quoits cottas cuteys coitus quotes quiets coatis ketose gaudies goatees goodies keddahs cuddies cutesie kowtows quietus gateaus caddies coatees
fatties patties tutties kitties tatties cutties jetties jutties chitties titties catties ditties hotties butties putties potties ties rottes fyttes mattes laities battues puttees settees dauties pities reties tates bawties duties cities lattes ghettoes whities lattice tuttis moieties buttes cooties pieties cuties booties beauties footies suttees sties mottoes dawties fouettes gaieties mottes totes deities lottes tides tis