As nouns the difference between backboard and packboard
is that backboard is (basketball) the flat vertical surface to which the basket is attached while packboard is a board worn on the back like a backpack for carrying goods while travelling.
backboard
English
Noun
(
en noun)
(basketball) The flat vertical surface to which the basket is attached.
(tennis) A flat vertical wall with the image of a tennis net drawn or painted on it. Designed to practice hitting against such that the ball bounces back.
(medicine, first aid) A spine board.
packboard
English
Noun
(
en noun)
A board worn on the back like a backpack for carrying goods while travelling.