Nacks vs Gacks - What's the difference?

As verbs the difference between nacks and gacks

is that nacks is third-person singular of nack while gacks is third-person singular of gack.

(head)

(nack)

(en verb)

(computing) To acknowledge negatively; to send a NAK signal to.

(head)

(gack)

(en interjection)

(often, repeated several times) The sound of a cat coughing up a hairball.

Also used of similar noises, particularly one made to show disgust or disapproval.

(en verb)

To make a 'gack' noise.

To expectorate a hairball.

* (English Citations of "gack") ----