pool vs swimming pool

pool and swimming pool both are nouns.

Word	Noun	Adjective	Verb	Adverb
pool	Yes	No	Yes	No
swimming pool	Yes	No	No	No

As nouns, swimming pool is a hyponym of pool; that is, swimming pool is a word with a more specific, narrower meaning than pool:

Other hyponyms of pool include cistern, natatorium, swimming bath, wading pool, water jump.

pool (noun)	swimming pool (noun)
any of various games played on a pool table having 6 pockets	pool that provides a facility for swimming
an excavation that is (usually) filled with water
an association of companies for some definite purpose
an organization of people or resources that can be shared
something resembling a pool of liquid
a small lake
a small body of standing water (rainwater) or other liquid
any communal combination of funds
the combined stakes of the betters

pool (verb)	swimming pool (verb)
join or form a pool of people
combine into a common fund