Read the dictionary definition of contrastive. All definitions for this word.
1. syntactically establishing a relation of contrast between sentences or elements of a sentence
1. disjunctive conjunctions like `but', `or', or `though' serve a contrastive function
2. strikingly different; tending to contrast
1. contrasting (or contrastive) colors
3. of words so related that one contrasts with the other
1. `rich' and `hard-up' are contrastive terms