work force vs workforce

work force and workforce both are nouns.

Word	Noun	Adjective	Verb	Adverb
work force	Yes	No	No	No
workforce	Yes	No	No	No

As nouns, work force and workforce are synonyms defined as:

Other synonyms of work force include hands, manpower, men.

work force (noun)	workforce (noun)
the force of workers available	the force of workers available