spa vs fat farm

spa and fat farm both are nouns.

Word	Noun	Adjective	Verb	Adverb
spa	Yes	No	No	No
fat farm	Yes	No	No	No

As nouns, fat farm is a hyponym of spa; that is, fat farm is a word with a more specific, narrower meaning than spa:

spa: a place of business with equipment and facilities for exercising and improving physical fitness
fat farm: a health spa that specializes in helping people lose weight

spa (noun)	fat farm (noun)
a fashionable hotel usually in a resort area	a health spa that specializes in helping people lose weight
a place of business with equipment and facilities for exercising and improving physical fitness
a health resort near a spring or at the seaside