throwster vs thrower

throwster and thrower both are nouns.

Word	Noun	Adjective	Verb	Adverb
throwster	Yes	No	No	No
thrower	Yes	No	No	No

As nouns, throwster and thrower are synonyms defined as:

throwster and thrower: a person who twists silk or rayon filaments into a thread or yarn

throwster (noun)	thrower (noun)
a person who twists silk or rayon filaments into a thread or yarn	someone who projects something (especially by a rapid motion of the arm)
	a craftsman who shapes pottery on a potter's wheel and bakes them in a kiln
	a person who twists silk or rayon filaments into a thread or yarn