tactfulness vs tact

tactfulness and tact both are nouns.

Word	Noun	Adjective	Verb	Adverb
tactfulness	Yes	No	No	No
tact	Yes	No	No	No

As nouns, tactfulness and tact are synonyms defined as:

tactfulness and tact: consideration in dealing with others and avoiding giving offense

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

tactfulness: Behavior or actions characterized by careful consideration in dealing with others, to avoid giving offense.
tact: consideration in dealing with others and avoiding giving offense

Other hypernyms of tactfulness include tactfulness, courtesy, good manners.

tactfulness (noun)	tact (noun)
consideration in dealing with others and avoiding giving offense	consideration in dealing with others and avoiding giving offense
Behavior or actions characterized by careful consideration in dealing with others, to avoid giving offense.