Yes, sub is a Scrabble word!

...and is worth 5 points in Scrabble, and 7 points in Words with Friends

sub

Verb

1. Be a substitute

Noun

1. 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

2. A submersible warship usually armed with torpedoes

What Scrabble words can I make with the letters in sub?

3 Letter Words

2 Letter Words

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1 Anagram of Sub

Words that can be created with an extra letter added to sub:

A:subaC:cubsB:bubsD:budsdubsG:bugsF:fubsH:bushhubsK:buskM:bumsL:slubN:bunsnubssnubP:pubsS:busssubsR:bursrubsurbsT:bustbutsstubtubsY:busybuys