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.
bull bully bulla boulle bullae bill buhl ball boll bell belle boule bally billy belly bellow billie billow bel bal billowy bolo bole bile bowl baal bail blaw bawl blew blah blae bale blow bola boil blue blowy boyla bluey belay bialy biali below belie bylaw
bull full hull cull gull lull mull null pull dull