Phineas Taylor Barnum vs P. T. Barnum

Phineas Taylor Barnum and P. T. Barnum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Phineas Taylor Barnum	Yes	No	No	No
P. T. Barnum	Yes	No	No	No

As nouns, Phineas Taylor Barnum and P. T. Barnum are synonyms defined as:

Phineas Taylor Barnum and P. T. Barnum: United States showman who popularized the circus (1810-1891)

Other synonyms of Phineas Taylor Barnum include Barnum.

Phineas Taylor Barnum (noun)	P. T. Barnum (noun)
United States showman who popularized the circus (1810-1891)	United States showman who popularized the circus (1810-1891)