work camp vs prison farm

work camp and prison farm both are nouns.

Word	Noun	Adjective	Verb	Adverb
work camp	Yes	No	No	No
prison farm	Yes	No	No	No

As nouns, work camp and prison farm are synonyms defined as:

work camp and prison farm: a camp for trustworthy prisoners employed in government projects

Other synonyms of work camp include prison camp.

work camp (noun)	prison farm (noun)
a camp for trustworthy prisoners employed in government projects	a camp for trustworthy prisoners employed in government projects