How many words start with REB?

10, from 5 letters up to 5. All of them are on this page.

What is the highest scoring word that start with REB?

REBUY at 10 points in Scrabble, and REBBE at 11 in Words With Friends, because the two games score the tiles differently.

REBAR, REBBE, REBEC, REBEL, REBID, REBIT, REBOP, REBUS, REBUT, REBUY.

10 of them: REBAR, REBBE, REBEC, REBEL, REBID, REBIT, REBOP, REBUS, REBUT, REBUY.

There are 10 of them. The highest scoring is REBUY at 10 points in Scrabble, and the set averages 8.0.

Most common words first, then the rest A to Z.

The most familiar words on this page and what they mean. Tap any word for its full entry, score and anagrams.

REBEL noun a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)
REBUS noun a puzzle where you decode a message consisting of pictures representing syllables and words
REBUT verb overthrow by argument, evidence, or proof

Definitions from Open English WordNet, CC BY 4.0.

All of them: Word lists.