labor force vs labor pool

labor force and labor pool both are nouns.

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

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

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

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