Is “Chiefly” a Scrabble word?
Yes
CHIEFLY
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 Chiefly
/ˈtʃiːf.li/
adjective
1.Of or relating to a chief
adverb
1.(focus) Especially or primarily; above all.
2.(focus) Mainly or principally; almost entirely.
Synonyms: first and foremost, particularly, by and large, for the most part, largely