Nark vs Nary - What's the difference?

As a noun nark

is (british|slang) a police spy or informer or nark can be (narcotics officer).

is (slang) to serve or behave as a spy or informer.

not one.

(wikipedia nark)

From (etyl) nak.

* narc

(en noun)

(British, slang) A police spy or informer.

* 1912 , , Act I,

It’s a—well, it’s a copper’s nark , as you might say. What else would you call it? A sort of informer.

(en verb)

(slang) To serve or behave as a spy or informer.

(slang) To annoy or irritate.

It really narks me when people smoke in restaurants.

(slang) To complain.

He narks in my ear all day, moaning about his problems.

(transitive, slang, often imperative) To stop.

Nark it! I hear someone coming!

* * tattle

See narc

(en noun)

(narcotics officer).

* * Oxford English Dictionary , 2nd ed., 1989.

(-)

not one

There was nary a blip in sales.

* nary a