cross-examination vs cross examine

cross-examination is a noun but cross examine is not a noun.

Word	Noun	Adjective	Verb	Adverb
cross-examination	Yes	No	No	No
cross examine	No	No	Yes	No

cross-examination (noun)	cross examine (noun)
(law) close questioning of a hostile witness in a court of law to discredit or throw a new light on the testimony already provided in direct examination

cross-examination (verb)	cross examine (verb)
	question closely, or question a witness that has already been questioned by the opposing side