spa vs playground

spa and playground both are nouns.

Word	Noun	Adjective	Verb	Adverb
spa	Yes	No	No	No
playground	Yes	No	No	No

As nouns, playground is a hypernym of spa; that is, playground is a word with a broader meaning than spa:

spa: a health resort near a spring or at the seaside
playground: an area where many people go for recreation, holidays or other purposes

Other hypernyms of spa include resort area, vacation spot.

spa (noun)	playground (noun)
a fashionable hotel usually in a resort area	yard consisting of an outdoor area for children's play
a place of business with equipment and facilities for exercising and improving physical fitness	an area where many people go for recreation, holidays or other purposes
a health resort near a spring or at the seaside