sea-coast vs sands

sea-coast and sands both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea-coast	Yes	No	No	No
sands	Yes	No	No	No

As nouns, sands is a hyponym of sea-coast; that is, sands is a word with a more specific, narrower meaning than sea-coast:

Other hyponyms of sea-coast include litoral, littoral, littoral zone, landfall, seaboard, seaside, tideland.

sea-coast (noun)	sands (noun)
the shore of a sea or ocean	the region of the shore of a lake or sea or ocean