viewpoint vs landscape

viewpoint and landscape both are nouns.

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

As nouns, landscape is a hyponym of viewpoint; that is, landscape is a word with a more specific, narrower meaning than viewpoint:

Other hyponyms of viewpoint include cityscape, angle, slant, complexion.

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

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