juxtaposition vs apposition

juxtaposition and apposition both are nouns.

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

As nouns, juxtaposition and apposition are synonyms defined as:

juxtaposition and apposition: the act of positioning close together (or side by side)

Other synonyms of juxtaposition include collocation.

juxtaposition (noun)	apposition (noun)
the act of positioning close together (or side by side)	the act of positioning close together (or side by side)
a side-by-side position	(biology) growth in the thickness of a cell wall by the deposit of successive layers of material
	a grammatical relation between a word and a noun phrase that follows