breath vs activity

breath and activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
breath	Yes	No	No	No
activity	Yes	No	No	No

As nouns, activity is a hypernym of breath; that is, activity is a word with a broader meaning than breath:

Other hypernyms of breath include bodily function, bodily process, body process.

breath (noun)	activity (noun)
the process of taking in and expelling air during breathing	any specific behavior
an indirect suggestion	the trait of being active; moving or acting rapidly and energetically
a slight movement of the air	an organic process that takes place in the body
the air that is inhaled and exhaled in respiration	a process existing in or produced by nature (rather than by the intent of human beings)
a short respite	the state of being active
	(chemistry) the capacity of a substance to take part in a chemical reaction