unusual person vs anomaly

unusual person and anomaly both are nouns.

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

As nouns, unusual person and anomaly are synonyms defined as:

unusual person (noun)	anomaly (noun)
a person who is unusual	(astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)
	a person who is unusual
	deviation from the normal or common order or form or rule