seaweed vs tang

seaweed and tang both are nouns.

Word	Noun	Adjective	Verb	Adverb
seaweed	Yes	No	No	No
tang	Yes	No	No	No

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

Other hyponyms of seaweed include arame, wrack, seagrass, sea wrack, wrack, sea tang.

seaweed (noun)	tang (noun)
plant growing in the sea, especially marine algae	any of various kelps especially of the genus Laminaria
	any of various coarse seaweeds
	brown algae seaweed with serrated edges
	a common rockweed used in preparing kelp and as manure
	a tart spicy quality
	the taste experience when a savoury condiment is taken into the mouth