module vs retentiveness

module and retentiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
module	Yes	No	No	No
retentiveness	Yes	No	No	No

As nouns, retentiveness is a hyponym of module; that is, retentiveness is a word with a more specific, narrower meaning than module:

module (noun)	retentiveness (noun)
a self-contained component (unit or item) that is used in combination with other components	the property of retaining possessions that have been acquired
computer circuit consisting of an assembly of electronic components (as of computer hardware)	the power of retaining liquid
detachable compartment of a spacecraft	the power of retaining and recalling past experience
one of the inherent cognitive or perceptual powers of the mind