astronomer vs Al-Hasan ibn al-Haytham

astronomer and Al-Hasan ibn al-Haytham both are nouns.

Word	Noun	Adjective	Verb	Adverb
astronomer	Yes	No	No	No
Al-Hasan ibn al-Haytham	Yes	No	No	No

astronomer (noun)	Al-Hasan ibn al-Haytham (noun)
a physicist who studies astronomy	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)