Sub vs. Sab: What's the Difference?

Sub and Sab Definitions
Sub
(Nautical) A submarine.
Sab
(informal) To sabotage, especially fox hunts in opposition to blood sports.
Sub
A submarine sandwich.
Sab
(informal) A saboteur, especially of fox hunts.
Sub
A substitute.
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Sab
(tincture) sable
Sub
To act as a substitute
A graduate student subbing for the professor.
Sub
To put or use (a person or thing) as a substitute
The coach subbed fresh players toward the end of the game. The cook subbed oil for butter.
Sub
Usage Problem To replace; substitute
The player was subbed after she committed two errors. Sub the chicken with tofu to make the dish vegetarian. See Usage Note at substitute.
Sub
A submarine.
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Sub
A submarine sandwich: a sandwich made on a long bun.
We can get subs at that deli.
Sub
(informal) A substitute, often in sports or teaching.
With the score 4 to 1, they brought in subs.
She worked as a sub until she got her teaching certificate.
Sub
A subscription: a payment made for membership of a club, etc.
Sub
A subtitle.
I've just noticed a mistake in the subs for this film.
Sub
A subroutine (sometimes one that does not return a value, as distinguished from a function, which does).
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Sub
(colloquial) A subeditor.
Sub
(colloquial) A subcontractor.
Sub
(slang) A subwoofer.
Sub
A submissive.
Sub
A subordinate.
Sub
A subaltern.
Sub
A subscription (or (by extension) a subscriber) to an online channel or feed.
I'm totally stoked; just got 10 new subs after my last video.
Sub
(colloquial) Subsistence money: part of a worker's wages paid before the work is finished.
Sub
(internet slang) subreddit
Sub
To substitute for.
Sub
To work as a substitute teacher, especially in primary and secondary education.
Sub
To replace (a player) with a substitute.
He never really made a contribution to the match, so it was no surprise when he was subbed at half time.
Sub
Less commonly, and often as sub on, to bring on (a player) as a substitute.
He was subbed on half way through the second half, and scored within minutes.
Sub
(British) To perform the work of a subeditor or copy editor; to subedit.
Sub
To subtitle (usually a film or television program).
Sub
To lend.
Sub
To subscribe.
Sub
(BDSM) To take a submissive role.
Sub
To coat with a layer of adhering material; to planarize by means of such a coating.
Sub
(microscopy) To prepare (a slide) with a layer of transparent substance to support and/or fix the sample.
Sub
Under.
Sub
A subordinate; a subaltern.
Sub
A shortened form of submarine, the boat.
Sub
A shortened form of submarine sandwich; also called hero, hero sandwich, and grinder.
Sub
A large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
Sub
A submersible warship usually armed with torpedoes
Sub
Be a substitute;
The young teacher had to substitute for the sick colleague
The skim milk substitutes for cream--we are on a strict diet