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.
hoarser horsier harasser
hoarser parser coarser raser nurser eraser bursera brasier riser verser raiser praiser purser pursuer dorser terser farcer harasser curser crasser greasier nursery horsier greaser peruser courser proser gorsier pursier creaser sarsar creasier tarsier worser
hoars hoarse hours horsy horsey horse horas hoers hearsay hearse hears harissa hares harass hairs haars ahorse