Parietal (art)
/pəˈrʌɪɪt(ə)l/
adjective
Parietal art is a term for art in caves, the definition usually extended to art in rock shelters under cliff overhangs.

Burner (graffiti)
/ˈbɜː(r)nə(r)/
noun
A large, more elaborate type of piece. The piece could be said to be "burning" out of the wall, billboard, or train-side.