lecture vs rebuke

lecture and rebuke both are nouns.

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

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

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

As verbs, lecture and rebuke are synonyms defined as:

lecture (noun)	rebuke (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)	rebuke (verb)
censure severely or angrily	censure severely or angrily
deliver a lecture or talk