catch pen vs catching pen

catch pen and catching pen both are nouns.

Word	Noun	Adjective	Verb	Adverb
catch pen	Yes	No	No	No
catching pen	Yes	No	No	No

As nouns, catch pen and catching pen are synonyms defined as:

catch pen and catching pen: a small or medium containment area for holding animals.

catch pen (noun)	catching pen (noun)
a small or medium containment area for holding animals.	a small or medium containment area for holding animals.