catalytic cracker vs cat cracker

catalytic cracker and cat cracker both are nouns.

Word	Noun	Adjective	Verb	Adverb
catalytic cracker	Yes	No	No	No
cat cracker	Yes	No	No	No

As nouns, catalytic cracker and cat cracker are synonyms defined as:

catalytic cracker and cat cracker: a chemical reactor for converting oils with high boiling points into fuels with lower boiling points in the presence of a catalyst

catalytic cracker (noun)	cat cracker (noun)
a chemical reactor for converting oils with high boiling points into fuels with lower boiling points in the presence of a catalyst	a chemical reactor for converting oils with high boiling points into fuels with lower boiling points in the presence of a catalyst