Lowell vs Percival Lowell

Lowell and Percival Lowell both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lowell	Yes	No	No	No
Percival Lowell	Yes	No	No	No

As nouns, Lowell and Percival Lowell are synonyms defined as:

Lowell and Percival Lowell: United States astronomer whose studies of Mars led him to conclude that Mars was inhabited (1855-1916)

Lowell (noun)	Percival Lowell (noun)
United States educator and president of Harvard University (1856-1943)	United States astronomer whose studies of Mars led him to conclude that Mars was inhabited (1855-1916)
United States poet (1874-1925)
United States astronomer whose studies of Mars led him to conclude that Mars was inhabited (1855-1916)
United States poet (1917-1977)