tosser vs thrower

tosser and thrower both are nouns.

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

As nouns, thrower is a hypernym of tosser; that is, thrower is a word with a broader meaning than tosser:

tosser: someone who throws lightly (as with the palm upward)
thrower: someone who projects something (especially by a rapid motion of the arm)

tosser (noun)	thrower (noun)
someone who throws lightly (as with the palm upward)	someone who projects something (especially by a rapid motion of the arm)
terms of abuse for a masturbator	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