chopper knife vs chopping knife

chopper knife and chopping knife both are nouns.

Word	Noun	Adjective	Verb	Adverb
chopper knife	Yes	No	No	No
chopping knife	Yes	No	No	No

As nouns, chopper knife and chopping knife are synonyms defined as:

chopper knife and chopping knife: a considerably big knife used for chopping or mincing meat, vegetables, etc.

chopper knife (noun)	chopping knife (noun)
a considerably big knife used for chopping or mincing meat, vegetables, etc.	a considerably big knife used for chopping or mincing meat, vegetables, etc.