cross examine vs cross-examination

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

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

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