juxtaposition vs collocation

juxtaposition and collocation both are nouns.

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

As nouns, juxtaposition and collocation are synonyms defined as:

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

Other synonyms of juxtaposition include apposition.

juxtaposition (noun)	collocation (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	a grouping of words in a sentence