Tennessee vs TN

Tennessee and TN both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tennessee	Yes	No	No	No
TN	Yes	No	No	No

As nouns, Tennessee and TN are synonyms defined as:

Tennessee and TN: a state in east central United States with capital Nashville

Other synonyms of Tennessee include Tenn., Volunteer State.

Tennessee (noun)	TN (noun)
a state in east central United States with capital Nashville	a state in east central United States with capital Nashville
a river formed by the confluence of two other rivers near Knoxville; it follows a U-shaped course to become a tributary of the Ohio River in western Kentucky