Northern lobster vs lobster

Northern lobster and lobster both are nouns.

Word	Noun	Adjective	Verb	Adverb
Northern lobster	Yes	No	No	No
lobster	Yes	No	No	No

As nouns, lobster is a hypernym of Northern lobster; that is, lobster is a word with a broader meaning than Northern lobster:

Northern lobster: flesh of cold-water lobsters having large tender claws; caught from Maine to the Carolinas
lobster: flesh of a lobster

Northern lobster (noun)	lobster (noun)
lobster of Atlantic coast of America	any of several edible marine crustaceans of the families Homaridae and Nephropsidae and Palinuridae
flesh of cold-water lobsters having large tender claws; caught from Maine to the Carolinas	flesh of a lobster