respiration vs activity

respiration and activity both are nouns.

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

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

respiration: the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation
activity: an organic process that takes place in the body

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

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

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

respiration (noun)	activity (noun)
the metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produced and absorbed by the blood to be transported to the lungs	any specific behavior
the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation	the trait of being active; moving or acting rapidly and energetically
a single complete act of breathing in and out	an organic process that takes place in the body
	a process existing in or produced by nature (rather than by the intent of human beings)
	the state of being active
	(chemistry) the capacity of a substance to take part in a chemical reaction