effeminacy vs sissiness

effeminacy and sissiness both are nouns.

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

As nouns, effeminacy and sissiness are synonyms defined as:

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

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

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