Copulative
Part of speech: adjective
Definition: Of or pertaining to copulation that acts as a copula that connects the subject of a clause with its complement
Copula
Part of speech: noun
Definition: A word used to link the subject of a sentence with a predicate (usually a subject complement or an adverbial); it serves to unite (or associate) the subject with the predicate. (e.g. be).A function that represents the association between two or more variables, independent of the individual marginal distributions of the variables.(grammar) A word, usually a verb, used to link the subject of a sentence with a predicate (usually a subject complement or an adverbial), that unites or associates the subject with the predicate.