microeconomist vs microeconomic expert

microeconomist and microeconomic expert both are nouns.

Word	Noun	Adjective	Verb	Adverb
microeconomist	Yes	No	No	No
microeconomic expert	Yes	No	No	No

As nouns, microeconomist and microeconomic expert are synonyms defined as:

microeconomist and microeconomic expert: an economist who specializes in microeconomics

microeconomist (noun)	microeconomic expert (noun)
an economist who specializes in microeconomics	an economist who specializes in microeconomics