gather vs reason out

gather is a noun but reason out is not a noun.

Word	Noun	Adjective	Verb	Adverb
gather	Yes	No	Yes	No
reason out	No	No	Yes	No

As verbs, reason out is a hypernym of gather; that is, reason out is a word with a broader meaning than gather:

Other hypernyms of gather include conclude, reason.

gather (noun)	reason out (noun)
the act of gathering something
sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching

gather (verb)	reason out (verb)
increase in amount by collecting or gathering	decide by reasoning; draw or come to a conclusion
increase or develop
conclude from evidence
assemble or get together
draw together into folds or puckers
look for (food) in nature
draw and bring closer
collect in one place
get people together