Is “Microorganism” a Scrabble word?
Yes
MICROORGANISM
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Microorganism
/ˌmaɪ.kɹəʊˈɔː.ɡən.ɪ.zəm̩/
noun
1.An organism that is too small to be seen by the unaided eye, especially a single-celled organism, such as a bacterium.
“The cud is then reswallowed and further digested by specialized microorganisms that live in the rumen.”