tact vs thoughtfulness

tact and thoughtfulness both are nouns.

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

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

Other hypernyms of tact include considerateness, consideration.

tact (noun)	thoughtfulness (noun)
consideration in dealing with others and avoiding giving offense	a considerate and thoughtful act
	the trait of thinking carefully before acting
	kind and considerate regard for others
	a calm, lengthy, intent consideration