convex polygon vs polygon

convex polygon and polygon both are nouns.

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

As nouns, polygon is a hypernym of convex polygon; that is, polygon is a word with a broader meaning than convex polygon:

convex polygon: 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
polygon: a closed plane figure bounded by straight sides

Other hypernyms of convex polygon include polygonal shape.

convex polygon (noun)	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 closed plane figure bounded by straight sides