Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun ufo

1 sense of ufo

Sense 1
unidentified flying object, UFO, flying saucer -- (an (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins)
       => apparition, phantom, phantasm, phantasma, fantasm, shadow -- (something existing in perception only; "a ghostly apparition at midnight")