convex polygon vs concave polygon

convex polygon and concave polygon both are nouns.

Word	Noun	Adjective	Verb	Adverb
convex polygon	Yes	No	No	No
concave polygon	Yes	No	No	No

convex polygon (noun)	concave polygon (noun)
a polygon such that no side extended cuts any other side or vertex; it can be cut by a straight line in at most two points	a polygon such that there is a straight line that cuts it in four or more points