fuse vs blend in

fuse is a noun but blend in is not a noun.

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

As verbs, blend in is a hyponym of fuse; that is, blend in is a word with a more specific, narrower meaning than fuse:

fuse (noun)	blend in (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

fuse (verb)	blend in (verb)
mix together different elements	cause (something) to be mixed with (something else)
make liquid or plastic by heating	blend or harmonize
become plastic or fluid or liquefied from heat
equip with a fuse; provide with a fuse