Definition of "Contrastive" :

adjective: syntactically establishing a relation of contrast between sentences or elements of a sentence

"Disjunctive conjunctions like but', or', or though' serve a contrastive function."

adjective: strikingly different; tending to contrast

"Contrasting (or contrastive) colors."

adjective: of words so related that one contrasts with the other

"Rich' and hard-up' are contrastive terms."