weatherman vs meteorologist

weatherman and meteorologist both are nouns.

Word	Noun	Adjective	Verb	Adverb
weatherman	Yes	No	No	No
meteorologist	Yes	No	No	No

As nouns, meteorologist is a hypernym of weatherman; that is, meteorologist is a word with a broader meaning than weatherman:

weatherman: predicts the weather
meteorologist: a specialist who studies processes in the earth's atmosphere that cause weather conditions

weatherman (noun)	meteorologist (noun)
predicts the weather	a specialist who studies processes in the earth's atmosphere that cause weather conditions