Is “Subkingdom” a Scrabble word?
Yes
SUBKINGDOM
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 Subkingdom
noun
1.A taxonomic category below kingdom and above superphylum.
2.A kingdom that is part of another kingdom, ruled by a subking.
Synonyms: subregnum