lecture vs reproof

lecture and reproof both are nouns.

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

As nouns, reproof is a hypernym of lecture; that is, reproof is a word with a broader meaning than lecture:

Other hypernyms of lecture include rebuke, reprehension, reprimand, reproval.

lecture (noun)	reproof (noun)
teaching by giving a discourse on some subject (typically to a class)	an act or expression of criticism and censure
a speech that is open to the public
a lengthy rebuke

lecture (verb)	reproof (verb)
censure severely or angrily	take to task
deliver a lecture or talk