A low sound or pitch. (Homonym of 'base')
Charles could sing bass notes with ease.
'Bass' is also a kind of freshwater fish: My brother loves to fish for bass (but in this case it rhymes with 'grass').
The bottom support of a structure. (Homonym of 'bass')
The base of the vase was narrow.
Base is also the thing you run across when you've hit a homerun!