Louis Armstrong vs Armstrong

Louis Armstrong and Armstrong both are nouns.

Word	Noun	Adjective	Verb	Adverb
Louis Armstrong	Yes	No	No	No
Armstrong	Yes	No	No	No

As nouns, Louis Armstrong and Armstrong are synonyms defined as:

Louis Armstrong and Armstrong: United States pioneering jazz trumpeter and bandleader (1900-1971)

Other synonyms of Louis Armstrong include Satchmo.

Louis Armstrong (noun)	Armstrong (noun)
United States pioneering jazz trumpeter and bandleader (1900-1971)	United States pioneering jazz trumpeter and bandleader (1900-1971)
	United States astronaut; the first man to set foot on the Moon (July 20, 1969) (1930-)