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.
simars smears samaras sambars simmers cymars summaries summarise summers samburs seemers seamers sombrous zamarras zamarros summarize samurais
mars cymars simars chimars damars dammars mirs boomers mares lemurs maimers hummers homers namers amirs lumbars comers mimers smears mimbars maras aimers tamers femurs seamers shmears shammers roomers hammers rumors samaras embars rhymers mairs cummers gomers dammers demurs dimmers timers gamers gammers roamers rummers mummers emmers marse jammers rimmers reamers bummers foamers simmers humors rammers fumers rimers omers limmers gummers mammers summers hemmers emirs ambaris mors sambars seemers vomers daymares maars dimers tamaris teemers tumors chimers shimmers yammers
simar samara simmer smear smeary