The term 'spookily strange' can be summed up by the word 'EERIE, ' which is a five-letter word. EERIE is an adjective that describes something as being mysterious, frightening, or unsettling. It is often used to describe supernatural or paranormal phenomena, such as ghosts, witches, and other supernatural creatures. It can also be used to describe a feeling of unease or dread in a certain place or situation.