headstand vs acrobatic feat

headstand and acrobatic feat both are nouns.

Word	Noun	Adjective	Verb	Adverb
headstand	Yes	No	No	No
acrobatic feat	Yes	No	No	No

As nouns, acrobatic feat is a hypernym of headstand; that is, acrobatic feat is a word with a broader meaning than headstand:

headstand: an acrobatic feat in which a person balances on the head (usually with the help of the hands)
acrobatic feat: a stunt performed by an acrobat

Other hypernyms of headstand include acrobatic stunt.

headstand (noun)	acrobatic feat (noun)
an acrobatic feat in which a person balances on the head (usually with the help of the hands)	a stunt performed by an acrobat