Here's a breakdown:
* canu (pronounced "kah-noo") is the verb for singing.
* canwr (pronounced "kah-nweer") is the noun for a male singer.
* canwraig (pronounced "kah-nwraig") is the noun for a female singer.
You can use "canu" in a sentence like this:
* Rwy'n hoffi canu. (I like to sing.)