lecture vs pedagogy

lecture and pedagogy both are nouns.

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

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

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

Other hypernyms of lecture include instruction, teaching.

lecture (noun)	pedagogy (noun)
teaching by giving a discourse on some subject (typically to a class)	the profession of a teacher
a speech that is open to the public	the activities of educating or instructing; activities that impart knowledge or skill
a lengthy rebuke	the principles and methods of instruction

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