pulmonary tuberculosis vs T.B.

pulmonary tuberculosis and T.B. both are nouns.

Word	Noun	Adjective	Verb	Adverb
pulmonary tuberculosis	Yes	No	No	No
T.B.	Yes	No	No	No

As nouns, T.B. is a hypernym of pulmonary tuberculosis; that is, T.B. is a word with a broader meaning than pulmonary tuberculosis:

pulmonary tuberculosis: involving the lungs with progressive wasting of the body
T.B.: infection transmitted by inhalation or ingestion of tubercle bacilli and manifested in fever and small lesions (usually in the lungs but in various other parts of the body in acute stages)

Other hypernyms of pulmonary tuberculosis include TB, tuberculosis.

pulmonary tuberculosis (noun)	T.B. (noun)
involving the lungs with progressive wasting of the body	infection transmitted by inhalation or ingestion of tubercle bacilli and manifested in fever and small lesions (usually in the lungs but in various other parts of the body in acute stages)