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.
shirred chirred shred shored shrewd shared shaird choired sheared churred charred chaired sheered shirt shard sherd shrewdie shirty chored chared shroud tiaraed shortie cheered choreoid chard chord short shorty charade choroid sheroot
birred chirred yirred whirred shirred ired haired harried paired knarred gnarred married laired quarried carried fired curried jarred erred charred rared sired tarred tiered waired wherried whirried worried choired parried heired hired furred churred herried quired garred jerreed faired curred ferried berried parred serried marred mired hurried deaired tarried tired warred barred aired wired chaired burred purred red
shirr chirr chirre sherry shier shire