HOLLOO is validvalid

to hallo [v HOLLOOED, HOLLOOING, HOLLOOS]

21,662 of 196,601 in NWL2023·also valid in CSW24

to shout out a greeting, also HALLO, HALLOA, HALLOO, HELLO, HILLO, HILLOA, HOLLA, HOLLO, HOLLOA, HULLO [v -ED, -ING, -S]