linking verb vs verb

linking verb and verb both are nouns.

Word	Noun	Adjective	Verb	Adverb
linking verb	Yes	No	No	No
verb	Yes	No	No	No

As nouns, verb is a hypernym of linking verb; that is, verb is a word with a broader meaning than linking verb:

linking verb: an equating verb (such as `be' or `become') that links the subject with the complement of a sentence
verb: a content word that denotes an action, occurrence, or state of existence

linking verb (noun)	verb (noun)
an equating verb (such as `be' or `become') that links the subject with the complement of a sentence	a content word that denotes an action, occurrence, or state of existence
	the word class that serves as the predicate of a sentence