scenery vs seascape

scenery and seascape both are nouns.

Word	Noun	Adjective	Verb	Adverb
scenery	Yes	No	No	No
seascape	Yes	No	No	No

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

Other hyponyms of scenery include landscape.

scenery (noun)	seascape (noun)
the painted structures of a stage set that are intended to suggest a particular locale	a painting of the sea (as distinguished from a landscape)
the appearance of a place	a view of the sea