effeminacy vs effeminateness

effeminacy and effeminateness both are nouns.

Word	Noun	Adjective	Verb	Adverb
effeminacy	Yes	No	No	No
effeminateness	Yes	No	No	No

As nouns, effeminacy and effeminateness are synonyms defined as:

effeminacy and effeminateness: the trait of being effeminate (derogatory of a man)

Other synonyms of effeminacy include sissiness, softness, unmanliness, womanishness.

effeminacy (noun)	effeminateness (noun)
the trait of being effeminate (derogatory of a man)	the trait of being effeminate (derogatory of a man)