As nouns the difference between decreaser and degreaser
is that decreaser is one who, or that which, decreases while degreaser is an industrial solvent, often containing polyhalogenated hydrocarbons, used to remove grease from mechanical parts.
degreaser
English
Noun
(
en noun)
An industrial solvent, often containing polyhalogenated hydrocarbons, used to remove grease from mechanical parts
A machine that accomplishes this task