anomaly vs anomalousness

anomaly and anomalousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
anomaly	Yes	No	No	No
anomalousness	Yes	No	No	No

As nouns, anomaly and anomalousness are synonyms defined as:

anomaly and anomalousness: deviation from the normal or common order or form or rule

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