Ump vs Mump - What's the difference?

In lang=en terms the difference between ump and mump

is that ump is to act as an umpire while mump is to beg, especially if using a repeated phrase.

is that ump is to act as an umpire while mump is to mumble, speak unclearly.

is (baseball) an umpire.

(Initialism) (head)

uridine monophosphate

* cUMP

(en verb)

To mumble, speak unclearly.

To move the lips with the mouth closed; to mumble, as in sulkiness.

* 1630 , Taylor

He mumps , and lowres, and hangs the lip.

To beg, especially if using a repeated phrase.

To deprive of (something) by cheating; to impose upon.

To cheat; to deceive; to play the beggar.

* Burke

And then when mumping with a sore leg, canting and whining.

To be sullen or sulky.

(Webster 1913)

* Mumping Day