chicken run vs hen yard

chicken run and hen yard both are nouns.

Word	Noun	Adjective	Verb	Adverb
chicken run	Yes	No	No	No
hen yard	Yes	No	No	No

As nouns, chicken run and hen yard are synonyms defined as:

Other synonyms of chicken run include chicken yard, fowl run.

chicken run (noun)	hen yard (noun)
an enclosed yard for keeping poultry	an enclosed yard for keeping poultry