commentator vs expert

commentator and expert both are nouns.

Word	Noun	Adjective	Verb	Adverb
commentator	Yes	No	No	No
expert	Yes	Yes	No	No

As nouns, expert is a hypernym of commentator; that is, expert is a word with a broader meaning than commentator:

commentator (noun)	expert (noun)
a writer who reports and analyzes events of the day	a person with special knowledge or ability who performs skillfully
an expert who observes and comments on something

commentator (adjective)	expert (adjective)
	having or showing knowledge and skill and aptitude
	of or relating to or requiring special knowledge to be understood