Swith is a 5 letter English word. It's valid Scrabble word worth 11 points. It's valid Words with friends word worth 10 points.
You can make 51 anagrams from letters in swith (histw).
before 900; Middle English (adv.), Old English swīthe strongly, equivalent to swīth strong (cognate with German geschwind, Old Norse svinnr fast, Gothic swinths strong) + -e adv. suffix