lecture room(n = noun.artifact) - classroom where lectures are given;
is a kind of classroom, schoolroom

N  school, academy, university, alma mater, college, seminary, Lyceum, institute, institution, palaestra, Gymnasium, class, seminar, day school, boarding school, preparatory school, primary school, infant school, dame's school, grammar school, middle class school, Board school, denominational school, National school, British and Foreign school, collegiate school, art school, continuation school, convent school, County Council school, government school, grant-in-aid school, high school, higher grade school, military school, missionary school, naval school, naval academy, state-aided school, technical school, voluntary school, school, school of art, kindergarten, nursery, creche, reformatory, pulpit, lectern, soap box desk, reading desk, ambo, lecture room, theater, auditorium, amphitheater, forum, state, rostrum, platform, hustings, tribune, school book, horn book, text book, grammar, primer, abecedary, rudiments, manual, vade mecum, encyclopedia, cyclopedia, Lindley Murray, Cocker, dictionary, lexicon, professorship, lectureship, readership, fellowship, tutorship, chair, School Board Council of Education, Board of Education, Board of Studies, Prefect of Studies, Textbook Committee, propaganda, scholastic, academic, collegiate, educational, ex cathedra.

adjoining room, amber room, baby's room, back room, bedsitting room, billiard room, boiler room, breathing room, chat room, child's room, city room, clean room, common room, conference room, connecting room, control room, curtain lecture, cutting room, dead room, dining room, dorm room, dormitory room, drawing room, dressing room, elbow room, emergency room, engine room, family room, front room, furnace room, game room, gun room, home room, hospital room, hotel room, ladies' room, laminar flow clean room, lecture, lecture demonstration, living room, locker room, lumber room, men's room, morning room, motel room, operating room, powder room, public lecture, pump room, reading room, rec room, reception room, recovery room, recreation room, rest room, room, room access, room clerk, room decorator, room light, room rate, room temperature, rumpus room, sea room, seating room, sewing room, shipping room, shower room, sitting room, sleeping room, smoking room, squad room, standing room, standing room only, steam room, still room, stock room, storage room, strong room, sweat room, television room, test room, testing room, tv room, waiting room, war room, wash room, white room, wiggle room, withdrawing room