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Synonyms for Artificer (same or very similar meaning)

WordNet sense 1 (someone who is the first to think of or make something):
discoverer, inventor

WordNet sense 2 (a skilled worker who practices some trade or handicraft):
artisan, craftsman, journeyman

WordNet sense 3 (an enlisted man responsible for the upkeep of small arms and machine guns etc.):
armorer, armourer

From the ODE community, based on WordNetadd/edit