sissiness vs effeminacy

sissiness and effeminacy both are nouns.

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

As nouns, sissiness and effeminacy are synonyms defined as:

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

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

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