Is “Complexity” a Scrabble word?
Yes
COMPLEXITY
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 Complexity
/kəmˈplɛk.sɪ.ti/
noun
1.The state of being complex; intricacy; entanglement.
2.That which is and renders complex; intricacy; complication.
Synonyms: complicacy