lecture vs lecturing

lecture and lecturing both are nouns.

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

As nouns, lecture and lecturing are synonyms defined as:

lecture and lecturing: teaching by giving a discourse on some subject (typically to a class)

lecture (noun)	lecturing (noun)
teaching by giving a discourse on some subject (typically to a class)	teaching by giving a discourse on some subject (typically to a class)
a speech that is open to the public
a lengthy rebuke

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