How many words start with SY?

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

What is the highest scoring word that start with SY?

SYBOW at 13 points in Scrabble, and SYBBE at 13 in Words With Friends, because the two games score the tiles differently.

SYBBE, SYBIL, SYBOE, SYBOW, SYCEE, SYCES, SYENS, SYKER, SYKES, SYLIS and 19 more on this page.

Yes, 6: SYLPH, SYNCH, SYNCS, SYNDS, SYNTH, SYPHS.

There are 29 of them. The highest scoring is SYBOW at 13 points in Scrabble, and the set averages 10.4.

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.

SYRUP noun a thick sweet sticky liquid
SYNOD noun a council convened to discuss ecclesiastical business
SYLPH noun a slender graceful young woman
SYLVA noun the forest trees growing in a country or region
SYNCS verb form of SYNC: make synchronous and adjust in time or manner
SYPHS noun form of SYPH: a common venereal disease caused by the treponema pallidum spirochete

Definitions from Open English WordNet, CC BY 4.0.

All of them: Word lists.