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.
tubas tubs tubes tibias tabs dubs tabus daubs tabes tabbis tobies taboos daubes debase diabase dubious tabbies dabs debs dibs doughboys
subas jubas tubas bas nubs daubs cubs bubus cobias fubs fubsy hubs babas tibias diabase subbase phobias abas obas pubes pubs rubs ceibas subahs tubes chubs nubias sobas bubs baas jubes boas bias bays bass base cubes pubis lubes jubbahs subs rubus rubes abbas bubbas subbass daubes debase dubs obias abase tubs shibahs
tuba tubae tub tubby tube stub stubby