lobster tail vs lobster

lobster tail and lobster both are nouns.

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

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

lobster tail (noun)	lobster (noun)
lobster tail meat; usually from spiny rock lobsters	any of several edible marine crustaceans of the families Homaridae and Nephropsidae and Palinuridae
	flesh of a lobster