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.
flirs fliers flairs flours floras floors fleers fluors filers flares feelers fillers fullers fuelers fellers fallers fowlers filarees fuellers flurries failures fooleries fluoresce fulleries valors velars valours valuers vealers veilers velours velures valorise valorous voleries
flirs coilers peelers fullers flairs tollers knollers jailors hauliers talars molars bawlers vealers dialers cullers liras sailors liars lollers feelers lars howlers ralliers hillers balers coolers bailers filers fuelers mylars callers glaires woolers colliers pliers yellers cholers wheelers wailers toilers talliers tailers dollars dalliers sealers cellars reliers pullers polers walrus velars bailors tilers duelers sillers rulers poolers oilers milliers liers mailers halers maulers heelers milers killers gillers coalers bowlers gaolers jolliers mullers fowlers fellers billers colors lairs hellers railers hollers ballers fallers quellers sailers collars blurs couloirs dealers valors fliers moilers tailors haulers jailers kneelers tolars fillers fuellers pallors willers pillars hullers beliers glairs mewlers healers malars hailers lullers boilers millers nailers pollers rollers sellers dolors tellers veilers shellers walers polars pulers reelers ceilers salliers slurs diallers duellers talers tillers toolers whalers chillers yowlers
flir flair flare flier flora florae flurry foliar