WordNet sense 1 (an electrical device that can interrupt the flow of electrical current when it is overloaded):

safety fuse, electrical fuse

WordNet sense 2 (any igniter that is used to initiate the burning of a propellant):

fusee, fuze, primer, priming, fuzee, primer

WordNet sense 3 (mix together different elements):

blend, coalesce, combine, commingle, conflate, flux, meld, merge, mix, immix, combine