contrastive

Of words so related that one contrasts with the other.

“`rich' and `hard-up' are contrastive terms”

Strikingly different; tending to contrast.

“contrasting (or contrastive) colors”

Syntactically establishing a relation of contrast between sentences or elements of a sentence.

“disjunctive conjunctions like `but', `or', or `though' serve a contrastive function”