xeno-
extraterrene
bug-eyed monster
cosmogenous
space alien
ultratelluric
extraplanetary
extramundane
xenophysics
visitor
eetee
alienly
alien abduction
spacy
xenogeology
xenotechnology
xenopaleontology
xenoscience
alien
foreign
xenoengineering
xenohistory
astrohistory
space invader
ultramundane
extraterrestrially
extraterrestriality
alienkind
xenochemistry
extraterrestrialization
xenoarchitecture
xenobiochemistry
ayy
other
little green man
xenomorphology
alienesque
extraterrestrialness
saucerian
unidentified flying object
UFO
flying saucer
alienage
exocommunication
alienism
xenoethics
mysterious
xenomorph
xenobiology
allotrious