lecturing vs teaching

lecturing and teaching both are nouns.

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

As nouns, teaching is a hypernym of lecturing; that is, teaching is a word with a broader meaning than lecturing:

lecturing: teaching by giving a discourse on some subject (typically to a class)
teaching: the profession of a teacher

Other hypernyms of lecturing include instruction, pedagogy.

lecturing (noun)	teaching (noun)
teaching by giving a discourse on some subject (typically to a class)	the profession of a teacher
	the activities of educating or instructing; activities that impart knowledge or skill
	a doctrine that is taught