apposition vs juxtaposition

apposition and juxtaposition both are nouns.

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

As nouns, apposition and juxtaposition are synonyms defined as:

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

Other synonyms of apposition include collocation.

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