monster vs unusual person

monster and unusual person both are nouns.

Word	Noun	Adjective	Verb	Adverb
monster	Yes	No	No	No
unusual person	Yes	No	No	No

As nouns, unusual person is a hypernym of monster; that is, unusual person is a word with a broader meaning than monster:

Other hypernyms of monster include anomaly.

monster (noun)	unusual person (noun)
(medicine) a grossly malformed and usually nonviable fetus	a person who is unusual
a cruel wicked and inhuman person
a person or animal that is markedly unusual or deformed
an imaginary creature usually having various human and animal parts
someone that is abnormally large and powerful