micro-organism vs being

micro-organism and being both are nouns.

Word	Noun	Adjective	Verb	Adverb
micro-organism	Yes	No	No	No
being	Yes	No	No	No

As nouns, being is a hypernym of micro-organism; that is, being is a word with a broader meaning than micro-organism:

micro-organism: any organism of microscopic size
being: a living thing that has (or can develop) the ability to act or function independently

Other hypernyms of micro-organism include organism.

micro-organism (noun)	being (noun)
any organism of microscopic size	a living thing that has (or can develop) the ability to act or function independently
	the state or fact of existing