savoir-faire vs tactfulness

savoir-faire and tactfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
savoir-faire	Yes	No	No	No
tactfulness	Yes	No	No	No

As nouns, tactfulness is a hypernym of savoir-faire; that is, tactfulness is a word with a broader meaning than savoir-faire:

savoir-faire: the ability to do or say what is appropriate for the occasion
tactfulness: consideration in dealing with others and avoiding giving offense

Other hypernyms of savoir-faire include tact.

savoir-faire (noun)	tactfulness (noun)
the ability to do or say what is appropriate for the occasion	consideration in dealing with others and avoiding giving offense
	Behavior or actions characterized by careful consideration in dealing with others, to avoid giving offense.