contrastive

adjective

1. of words so related that one contrasts with the other"‘rich’ and ‘hard-up’ are contrastive terms"
2. strikingly different; tending to contrast"contrasting (or contrastive) colors"
3. syntactically establishing a relation of contrast between sentences or elements of a sentence"disjunctive conjunctions like ‘but’, ‘or’, or ‘though’ serve a contrastive function"