lecture demonstration vs lecture

lecture demonstration and lecture both are nouns.

Word	Noun	Adjective	Verb	Adverb
lecture demonstration	Yes	No	No	No
lecture	Yes	No	Yes	No

lecture demonstration (noun)	lecture (noun)
presentation of an example of what the lecturer is discoursing about	teaching by giving a discourse on some subject (typically to a class)
	a speech that is open to the public
	a lengthy rebuke

lecture demonstration (verb)	lecture (verb)
	censure severely or angrily
	deliver a lecture or talk