Letters that make ack-ack
a, k, c are letters that make 'ack-ack'
1 possible definitions for 'ack-ack'
Under this definition, ack-ack is a noun and has the following properties:
antiaircraft gun, flak, flack, pom-pom, ack-ack gun, antiaircraft have the same meaning as 'ack-ack'
'ack-ack' can be a type of gun.
Bofors gun is a type of ack-ack.
predictor is a part of ack-ack.
antiaircraft is a derivative of ack-ack.