Gray vs poet

Gray and poet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gray	Yes	No	No	No
poet	Yes	No	No	No

Gray (noun)	poet (noun)
United States botanist who specialized in North American flora and who was an early supporter of Darwin's theories of evolution (1810-1888)	a writer of poems (the term is usually reserved for writers of good poetry)
American navigator who twice circumnavigated the globe and who discovered the Columbia River (1755-1806)
English poet best known for his elegy written in a country churchyard (1716-1771)
English radiobiologist in whose honor the gray (the SI unit of energy for the absorbed dose of radiation) was named (1905-1965)