second sight vs parapsychology

second sight and parapsychology both are nouns.

Word	Noun	Adjective	Verb	Adverb
second sight	Yes	No	No	No
parapsychology	Yes	No	No	No

As nouns, parapsychology is a hypernym of second sight; that is, parapsychology is a word with a broader meaning than second sight:

second sight: apparent power to perceive things that are not present to the senses
parapsychology: phenomena that appear to contradict physical laws and suggest the possibility of causation by mental processes

Other hypernyms of second sight include psychic phenomena, psychic phenomenon.

second sight (noun)	parapsychology (noun)
apparent power to perceive things that are not present to the senses	phenomena that appear to contradict physical laws and suggest the possibility of causation by mental processes