tang vs Fucus serratus

tang and Fucus serratus both are nouns.

Word	Noun	Adjective	Verb	Adverb
tang	Yes	No	No	No
Fucus serratus	Yes	No	No	No

As nouns, tang and Fucus serratus are synonyms defined as:

Other synonyms of tang include serrated wrack.

tang (noun)	Fucus serratus (noun)
any of various kelps especially of the genus Laminaria	brown algae seaweed with serrated edges
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