contrastive

adjective

1. Contrasting.

2. Of words so related that one contrasts with the other

   “‘rich’ and ‘hard-up’ are contrastive terms”

   Similar: incompatible

3. Strikingly different; tending to contrast

   “contrasting (or contrastive) colors”

   Similar: contrasting

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

   “disjunctive conjunctions like ‘but’, ‘or’, or ‘though’ serve a contrastive function”