placement vs activity

placement and activity both are nouns.

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

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

placement (noun)	activity (noun)
the act of putting something in a certain place	any specific behavior
contact established between applicants and prospective employees	the trait of being active; moving or acting rapidly and energetically
the spatial property of the way in which something is placed	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