spa vs watering hole

spa and watering hole both are nouns.

Word	Noun	Adjective	Verb	Adverb
spa	Yes	No	No	No
watering hole	Yes	No	No	No

As nouns, spa and watering hole are synonyms defined as:

Other synonyms of spa include watering place.

spa (noun)	watering hole (noun)
a fashionable hotel usually in a resort area	a health resort near a spring or at the seaside
a place of business with equipment and facilities for exercising and improving physical fitness
a health resort near a spring or at the seaside