microeconomist vs economist

microeconomist and economist both are nouns.

Word	Noun	Adjective	Verb	Adverb
microeconomist	Yes	No	No	No
economist	Yes	No	No	No

As nouns, economist is a hypernym of microeconomist; that is, economist is a word with a broader meaning than microeconomist:

Other hypernyms of microeconomist include economic expert.

microeconomist (noun)	economist (noun)
an economist who specializes in microeconomics	an expert in the science of economics