apposition vs placement

apposition and placement both are nouns.

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

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

Other hypernyms of apposition include emplacement, locating, location, position, positioning.

apposition (noun)	placement (noun)
the act of positioning close together (or side by side)	the act of putting something in a certain place
(biology) growth in the thickness of a cell wall by the deposit of successive layers of material	contact established between applicants and prospective employees
a grammatical relation between a word and a noun phrase that follows	the spatial property of the way in which something is placed