physicist vs Ibn al-Haytham

physicist and Ibn al-Haytham both are nouns.

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

physicist (noun)	Ibn 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)