There is a total of 131 clues beginning with uf
- UFO sightings
- UFO staff
- UFO tracker
- UFO tube
- UFO types
- UFO users
- UFO visitor
- UFO visitor, perhaps
- UFO's crew
- UFO's origin
- UFO's shape, perhaps
- UFO's, perhaps
- UFO, in old sci-fi films
- UFO, on a jetfighter's radar (Var)
- UFO, on jetfighter's radar
- UFO, perhaps
- UFO, possibly
- UFO-story genre
- UFO-tracking org
- UFO-watching org
- UFO
- Ufologist's concern
- Ufologist's concerns
- Ufologist's obsessions, for short
- Ufologist's study
- Ufology center
- UFOs in photos, often
- UFOs, say
- UFOs, sometimes
- UFOs, to the military
- UFW founder Chavez