meteorologist vs specializer

meteorologist and specializer both are nouns.

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

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

meteorologist: a specialist who studies processes in the earth's atmosphere that cause weather conditions
specializer: an expert who is devoted to one occupation or branch of learning

Other hypernyms of meteorologist include specialiser, specialist.

meteorologist (noun)	specializer (noun)
a specialist who studies processes in the earth's atmosphere that cause weather conditions	an expert who is devoted to one occupation or branch of learning