I thought the term colorist just referred to those of us who work in coloring books. I'm an artist, of sorts too and like you, I mostly did my artwork during a particular time in my life and haven't gotten back to it. At some point, I'll start a thread about my few charcoal drawings. I took an art class and tried my hand at oils, but did not like the smell of turpentine during the clean up. I also tried acrylics (my tubes of paint are still viable after decades) but, of course can't move them around like oils.