In context|chemistry|lang=en terms the difference between racemate and deracemization

is that racemate is (chemistry) any salt or ester of racemic acid while deracemization is (chemistry) the conversion of a racemate into a pure enantiomer or into a mixture in which one enantiomer is present in excess, or of a diastereoisomeric mixture into a single diastereoisomer or into a mixture in which one diastereoisomer predominates.

As nouns the difference between racemate and deracemization

is that racemate is (chemistry) a racemic mixture while deracemization is (chemistry) the conversion of a racemate into a pure enantiomer or into a mixture in which one enantiomer is present in excess, or of a diastereoisomeric mixture into a single diastereoisomer or into a mixture in which one diastereoisomer predominates.