Contrast.
Synonyms:
compare, differentiate, discriminate, oppose.
To compare (L. con, together, and par, equal) is to place together in order to show likeness or unlikeness; to contrast (L. contra, against, and sto, stand) is to set in opposition in order to show unlikeness. We contrast objects that have been already compared. We must compare them, at least momentarily, even to know that they are different. We contrast them when we observe their unlikeness in a general way; we differentiate them when we note the difference exactly and point by point. We distinguish objects when we note a difference that may fall short of contrast; we discriminate them when we classify or place them according to their differences.
Preposition:
We contrast one object with another.