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.
forest forestay freest fairest frost first fieriest furriest firriest foresaid foreside forced frusta frosty frowst veriest frowsty frisette fireside frizette verst farced frized verist verset verste farside frizzed varsity feracity ferocity voracity
wrest drest arrest forest queerest searest merest rarest fairest prest rearrest serest poorest yarest dearest sourest rest sheerest purest crest surest airest direst nearest dourest barest sorest grist wrist leariest merriest resit veriest priest purist verist karst horst verst hurst aurist erst wriest leeriest tourist corset charriest wurst worset weariest verset sorriest jurist curst tarriest driest aeriest teariest beeriest goriest hairiest preset freest tryst hoariest truest fieriest firriest horste first frost reset tercet verste prost rust resat aorist burst burriest breast lyrist trust reest querist diarist furriest airiest presto eeriest durst cheeriest mooriest miriest barghest wariest wiriest worst chariest crust
foresaw fores foresee fares feres fires forays force fours frees freeze fries frieze froes