Yack vs Ack - What's the difference?

As nouns the difference between yack and ack

is that yack is chatter while ack is the letter a as used in signalling and other types of communications.

is (slang) to vomit, usually because of intoxication.

(radio communications) acknowledged or ack can be expressing distaste, alarm, or trepidation.

(en noun)

chatter

(en verb)

(slang) to vomit, usually because of intoxication

(colloquial) to talk incessantly

I moved to another carriage on the train because the first one was full of people yacking on mobile phones.

* ----

(wikipedia ACK)

* ack

(en noun)

(internet) An acknowledgement either of a packet or a message received from a network.

* NAK