A geothermal pool is called a reservoir.
pool, lagoon
aquifer
Pond, pool.
A kitty. A fund. A pot.
The Latin word for the word pool is stagnum. The Italian word for pool is piscina, in Greek pisina, and in Danish it is said as pool.
Lido is another word for swimming-pool, so I should think the lido-deck is where the pool is.
pool already is an English word.
pool carpool swimming pool pool house
Pool hustler are sometimes called, "Pool Sharks".
In a word - NO.
They vary from one pool to another.