I. doom ‧ say ‧ er /ˈduːmˌseɪə $ -ər/ BrE AmE especially American English ( also doomster British English ) noun [countable]
someone who says that bad things are going to happen
II. doom ‧ ster /ˈduːmstə $ -ər/ BrE AmE noun [countable] British English informal
a ↑ doomsayer