old man vs America

old man and America both are nouns.

Word	Noun	Adjective	Verb	Adverb
old man	Yes	No	No	No
America	Yes	No	No	No

old man (noun)	America (noun)
an informal term for your father	North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
a man who is very old	North America and South America and Central America
a familiar term of address for a man
(slang) boss
aromatic herb of temperate Eurasia and North Africa having a bitter taste used in making the liqueur absinthe