reconsideration vs rethink

reconsideration and rethink both are nouns.

Word	Noun	Adjective	Verb	Adverb
reconsideration	Yes	No	No	No
rethink	Yes	No	Yes	No

As nouns, reconsideration and rethink are synonyms defined as:

reconsideration and rethink: thinking again about a choice previously made

Other synonyms of reconsideration include afterthought, second thought.

reconsideration (noun)	rethink (noun)
thinking again about a choice previously made	thinking again about a choice previously made
a consideration of a topic (as in a meeting) with a view to changing an earlier decision

reconsideration (verb)	rethink (verb)
	change one's mind