apposition vs collocation

apposition and collocation both are nouns.

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

As nouns, apposition and collocation are synonyms defined as:

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

Other synonyms of apposition include juxtaposition.

apposition (noun)	collocation (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 grouping of words in a sentence
a grammatical relation between a word and a noun phrase that follows