labor pool vs labor force

labor pool and labor force both are nouns.

Word	Noun	Adjective	Verb	Adverb
labor pool	Yes	No	No	No
labor force	Yes	No	No	No

As nouns, labor pool and labor force are synonyms defined as:

labor pool and labor force: the source of trained people from which workers can be hired

labor pool (noun)	labor force (noun)
the source of trained people from which workers can be hired	the source of trained people from which workers can be hired