How many words start with PS?

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

What is the highest scoring word that start with PS?

PSYCH at 15 points in Scrabble, and PSYCH at 15 in Words With Friends, because the two games score the tiles differently.

PSALM, PSEUD, PSHAW, PSION, PSOAE, PSOAI, PSOAS, PSORA, PSYCH, PSYOP.

There are 10 of them. The highest scoring is PSYCH at 15 points in Scrabble, and the set averages 9.2.

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.

PSALM noun any sacred song used to praise the deity
PSEUD noun a person who makes deceitful pretenses
PSOAS noun either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh
PSYOP noun military actions designed to influence the perceptions and attitudes of individuals, groups, and foreign governments

Definitions from Open English WordNet, CC BY 4.0.

All of them: Word lists.