complexion vs viewpoint

complexion and viewpoint both are nouns.

Word	Noun	Adjective	Verb	Adverb
complexion	Yes	No	Yes	No
viewpoint	Yes	No	No	No

As nouns, viewpoint is a hypernym of complexion; that is, viewpoint is a word with a broader meaning than complexion:

Other hypernyms of complexion include point of view, stand, standpoint.

complexion (noun)	viewpoint (noun)
the coloring of a person's face	a mental position from which things are viewed
(obsolete) a combination of elements (of dryness and warmth or of the four humors) that was once believed to determine a person's health and temperament	a place from which something can be viewed
texture and appearance of the skin of the face
a point of view or general attitude or inclination
a combination that results from coupling or interlinking

complexion (verb)	viewpoint (verb)
give a certain color to