interrelatedness vs interrelation

interrelatedness and interrelation both are nouns.

Word	Noun	Adjective	Verb	Adverb
interrelatedness	Yes	No	No	No
interrelation	Yes	No	No	No

As nouns, interrelatedness and interrelation are synonyms defined as:

interrelatedness and interrelation: mutual or reciprocal relation or relatedness

Other synonyms of interrelatedness include interrelationship.

interrelatedness (noun)	interrelation (noun)
mutual or reciprocal relation or relatedness	mutual or reciprocal relation or relatedness