action movie (a type of motion picture)

horror movie (motion picture which horrifies or frightens)

pink film, a partially-censored pornographic film, film erotica, a blue movie

creature feature, monster movie, kaiju film

documentary (documentary film)

(2channel slang) Someone tell me!

(aeronautics) trailing edge

after school

(anatomy) an occiput

a back gate / (figuratively) the anus, as a homophone for 肛門 and in contrast to 前門 (zenmon, “front gate”, figurative for vagina)