reexamine vs reexamination

reexamine is not a noun while reexamination is a noun.

Word	Noun	Adjective	Verb	Adverb
reexamine	No	No	Yes	No
reexamination	Yes	No	No	No

reexamine (noun)	reexamination (noun)
	a subsequent examination of a patient for the purpose of monitoring earlier treatment
	(law) questioning of a witness by the party that called the witness after that witness has been subject to cross-examination

reexamine (verb)	reexamination (verb)
look at again; examine again