effeminateness vs effeminacy

effeminateness and effeminacy both are nouns.

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

As nouns, effeminateness and effeminacy are synonyms defined as:

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

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

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