seascape vs scenery

seascape and scenery both are nouns.

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

As nouns, scenery is a hypernym of seascape; that is, scenery is a word with a broader meaning than seascape:

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