viscountess vs woman

viscountess and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
viscountess	Yes	No	No	No
woman	Yes	No	No	No

As nouns, woman is a hypernym of viscountess; that is, woman is a word with a broader meaning than viscountess:

Other hypernyms of viscountess include peer, adult female.

viscountess (noun)	woman (noun)
a noblewoman holding the rank of viscount in her own right	women as a class
a wife or widow of a viscount	an adult female person (as opposed to a man)
	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man