For most of them, yes. But horror is (or at least can be) distinct from fear. "The Silence of The Lambs" is horrifying, but not necessarily considered a horror

For most of them, yes. But horror is (or at least can be) distinct from fear. "The Silence of The Lambs" is horrifying, but not necessarily considered a horror movie. Likewise "Apocalypse Now", which is mostly about the emotion of horror, but not designed to frighten in any way.