linking verb vs copula

linking verb and copula both are nouns.

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

As nouns, linking verb and copula are synonyms defined as:

linking verb and copula: an equating verb (such as `be' or `become') that links the subject with the complement of a sentence

Other synonyms of linking verb include copulative.

linking verb (noun)	copula (noun)
an equating verb (such as `be' or `become') that links the subject with the complement of a sentence	an equating verb (such as `be' or `become') that links the subject with the complement of a sentence