seashore vs littoral

seashore and littoral both are nouns.

Word	Noun	Adjective	Verb	Adverb
seashore	Yes	No	No	No
littoral	Yes	Yes	No	No

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

Other hyponyms of seashore include litoral, littoral zone, sands, landfall, seaboard, seaside, tideland.

seashore (noun)	littoral (noun)
the shore of a sea or ocean	the region of the shore of a lake or sea or ocean

seashore (adjective)	littoral (adjective)
	of or relating to a coastal or shore region