high relief vs low relief

high relief and low relief both are nouns.

Word	Noun	Adjective	Verb	Adverb
high relief	Yes	No	No	No
low relief	Yes	No	No	No

high relief (noun)	low relief (noun)
a sculptural relief in which forms extend out from the background to at least half their depth	a sculptural relief in which forms extend only slightly from the background; no figures are undercut