Hey there kiddo,
A vocable is a fancy word for a word. Just like you know lots of words - like happy, sad, and play - other people have their own set of special words they use.
Vocables are often used in certain cultures or communities, and can have different meanings and uses than the words you might be used to. Sometimes people use vocables in songs or chants to make them more meaningful or powerful.
So in short, a vocable is just another word, but it might have special meaning to certain groups of people.