mix in vs fuse

mix in is not a noun while fuse is a noun.

Word	Noun	Adjective	Verb	Adverb
mix in	No	No	Yes	No
fuse	Yes	No	Yes	No

As verbs, fuse is a hypernym of mix in; that is, fuse is a word with a broader meaning than mix in:

Other hypernyms of mix in include blend, coalesce, combine, commingle, conflate, flux, immix, meld, merge, mix.

mix in (noun)	fuse (noun)
	any igniter that is used to initiate the burning of a propellant
	an electrical device that can interrupt the flow of electrical current when it is overloaded

mix in (verb)	fuse (verb)
cause (something) to be mixed with (something else)	mix together different elements
add as an additional element or part	make liquid or plastic by heating
	become plastic or fluid or liquefied from heat
	equip with a fuse; provide with a fuse