health spa vs health club

health spa and health club both are nouns.

Word	Noun	Adjective	Verb	Adverb
health spa	Yes	No	No	No
health club	Yes	No	No	No

As nouns, health spa and health club are synonyms defined as:

health spa and health club: a place of business with equipment and facilities for exercising and improving physical fitness

Other synonyms of health spa include spa.

health spa (noun)	health club (noun)
a place of business with equipment and facilities for exercising and improving physical fitness	a place of business with equipment and facilities for exercising and improving physical fitness