Is “Harping” a Scrabble word?
Yes
HARPING
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 Harping
/ˈhɑːpɪŋ/
verb
1.(usually with on) To repeatedly mention a subject.
“Why do you harp on a single small mistake?”
2.To play on (a harp or similar instrument)
3.To play (a tune) on the harp.
Synonyms: keep on, perseverate