synonymous
You are probably more familiar with the adjective "innocuous" than with "nocuous", its antonymous relative.
“Privacy” and “technology” have become almost antonymous.
The two terms are antonymous - they describe two things that are the opposite of each other.

SMART Vocabulary: related words and phrases

Opposites
antinome
antithesis
antithetical
anything
anything butidiom
diametric
diametrical
dichotomist
dichotomous
dichotomy
exactly
extreme
flip side
or otherwiseidiom
otherwise
polarity
pole
poles apartidiom
reverse
vice versa

You can also find related words, phrases, and synonyms in the topics:

Linguistics: terminology & vocabulary