landscape vs viewpoint

landscape and viewpoint both are nouns.

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

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

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

landscape (noun)	viewpoint (noun)
a genre of art dealing with the depiction of natural scenery	a mental position from which things are viewed
painting depicting an expanse of natural scenery	a place from which something can be viewed
an extensive mental viewpoint
an expanse of scenery that can be seen in a single view

landscape (verb)	viewpoint (verb)
do landscape gardening
embellish with plants