Snacc

According to the Old English Dictionary:

e;

snacc

f. (?) A swift-sailing vessel:--Ðá lét Eádweard cyng scypian xl snacca, Chr. 1052; Erl. 182, 36. Hé fór tó Scotlande mid xii snaccum, 1066; Erl. 201, 8. [(Borrowed from?) Icel. snekkja a swift-sailing vessel, belonging to the kind of 'lang-skip:' Dan. snekke a bark, sailing vessel.] snacc