primer vs time-fuse

primer and time-fuse both are nouns.

Word	Noun	Adjective	Verb	Adverb
primer	Yes	No	No	No
time-fuse	Yes	No	No	No

As nouns, time-fuse is a hyponym of primer; that is, time-fuse is a word with a more specific, narrower meaning than primer:

primer: any igniter that is used to initiate the burning of a propellant
time-fuse: a fuse made to burn for a given time (especially to explode a bomb)

Other hyponyms of primer include detonating fuse, safety fuse.

primer (noun)	time-fuse (noun)
any igniter that is used to initiate the burning of a propellant	a fuse made to burn for a given time (especially to explode a bomb)
the first or preliminary coat of paint or size applied to a surface
an introductory textbook