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.
smears simars samaras sambars seamers seemers simmers summers summarise cymars summaries samburs samurais sombrous zamarras zamarros summarize
smears shmears gomers numbers tamers marse homers fumers summers jammers cummers umbers meres mars cameras rimmers hummers lambers lumbers maars mairs emmers maras mimbars mammers shammers hammers maimers wommeras timbers dimmers dammars simmers omers embers chimeres chimars daymares mummers seemers mares roomers comers cymars gamers sambars limmers rhymers reamers cumbers lumbars hemmers rimers cambers bombers bummers ambers immerse emeers mimers aimers ameers gummers tamaris namers gammers rammers woomeras ambaris members foamers chambers humerus reimmerse gambiers chimeras rummers combers roamers boomers seamers dammers vomers timers samaras ombers limbers simars damars dimers teemers womeras chimaeras chimers shimmers embars ambeers yammers
smear smeary samara seamer seamier simar