Foo fighter and Unidentified flying object

Unidentified flying object and foo fighter are semantically related. In some cases you can replace phrase "Unidentified flying object" with "Foo fighter", this phrases are similar.

Unidentified flying object noun - An (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins.

Foo fighter and unidentified flying object are semantically related. Sometimes you can replace phrase "Foo fighter" with "Unidentified flying object", this phrases are similar.