physicist vs al-Haytham

physicist and al-Haytham both are nouns.

Word	Noun	Adjective	Verb	Adverb
physicist	Yes	No	No	No
al-Haytham	Yes	No	No	No

physicist (noun)	al-Haytham (noun)
a scientist trained in physics	an Egyptian polymath (born in Iraq) whose research in geometry and optics was influential into the 17th century; established experiments as the norm of proof in physics (died in 1040)