x

PHENOMENA and X have one thing in common. They could be anything.
a b c d e f g h i j k l m n o p q r s t u v w x y z
obelisk
oberon
obituary
oblivion
obscure
obscurity
obsession
obsidian
occult
oculus
odyssey
offend
olympos
olympus
omega
omen
opera
oracle
orbital
orphan
othello
outbreak
outlaws
overlook
overlord
oz
obey
obsessed
occultation
ominous
omnipotent
onyx
ophir
opticalillusion
oriel
osaka
osiris
ouroboros