thrower vs journeyman

thrower and journeyman both are nouns.

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

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

thrower: a craftsman who shapes pottery on a potter's wheel and bakes them in a kiln
journeyman: a skilled worker who practices some trade or handicraft

Other hypernyms of thrower include artificer, artisan, craftsman.

thrower (noun)	journeyman (noun)
someone who projects something (especially by a rapid motion of the arm)	a skilled worker who practices some trade or handicraft
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