How many words start with TAP?

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

What is the highest scoring word that start with TAP?

TAPPA at 9 points in Scrabble, and TAPPA at 11 in Words With Friends, because the two games score the tiles differently.

TAPAS, TAPED, TAPEN, TAPER, TAPES, TAPET, TAPIR, TAPIS, TAPPA, TAPUS.

10 of them: TAPAS, TAPED, TAPEN, TAPER, TAPES, TAPET, TAPIR, TAPIS, TAPPA, TAPUS.

There are 10 of them. The highest scoring is TAPPA at 9 points in Scrabble, and the set averages 7.3.

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.

TAPES verb form of TAP: cut a female screw thread with a tap
TAPED adjective secured or held in place by tape
TAPER noun a convex shape that narrows toward a point
TAPAS noun form of TAPA: the thin fibrous bark of the paper mulberry and Pipturus albidus
TAPIR noun large inoffensive chiefly nocturnal ungulate of tropical America and southeast Asia having a heavy body and fleshy snout
TAPIS noun a heavy textile with a woven design
TAPPA noun the thin fibrous bark of the paper mulberry and Pipturus albidus

Definitions from Open English WordNet, CC BY 4.0.

All of them: Word lists.