fusil vs musket

fusil and musket both are nouns.

Word	Noun	Adjective	Verb	Adverb
fusil	Yes	No	No	No
musket	Yes	No	No	No

As nouns, musket is a hypernym of fusil; that is, musket is a word with a broader meaning than fusil:

fusil: a light flintlock musket
musket: a muzzle-loading shoulder gun with a long barrel; formerly used by infantrymen

fusil (noun)	musket (noun)
a light flintlock musket	a muzzle-loading shoulder gun with a long barrel; formerly used by infantrymen