ayy
other
allotrious
foreign
alienly
alienesque
eetee
space invader
alienness
xenomorph
alienism
alienans
alienage
xenology
xenonatomy
extraterrene
astrohistory
xenohistory
bug-eyed monster
Pleiadean
unidentified flying object
moon-man
alienish
xenomythology
alienship
xenobotany
xenotechnology
alienlike
ultratelluric
space alien
semialien
xenosociology
astrophilosophy
starman
cosmogenous
ultramundane
exobiological
xeno-
visitor
xenomedicine
little green man
nonalien
xenocide
foregirth
xenopsychology
xenoscience
entity
xenophysics
estrangement
exocommunication