mourning vs activity

mourning and activity both are nouns.

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

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

Other hypernyms of mourning include expression, manifestation, reflection, reflexion.

mourning (noun)	activity (noun)
the passionate and demonstrative activity of expressing grief	any specific behavior
state of sorrow over the death or departure of a loved one	the trait of being active; moving or acting rapidly and energetically
	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

mourning (adjective)	activity (adjective)
sorrowful through loss or deprivation