vastakohta (englanniksi)

opposite (s: päinvastaista tarkoittava asia / asia, ilmiö / something opposite or contrary to another)
contrary (s: päinvastaista tarkoittava asia)
contrast (s: päinvastaista tarkoittava asia / difference between two objects, people or concepts)
antonym (s: päinvastaista tarkoittava asia / sana / word which has the opposite meaning to another)
antithesis (s: proposition that is the diametric opposite of some other proposition)