hatchet vs weapon system

hatchet and weapon system both are nouns.

Word	Noun	Adjective	Verb	Adverb
hatchet	Yes	No	No	No
weapon system	Yes	No	No	No

As nouns, weapon system is a hypernym of hatchet; that is, weapon system is a word with a broader meaning than hatchet:

hatchet: weapon consisting of a fighting ax; used by North American Indians
weapon system: any instrument or instrumentality used in fighting or hunting

Other hypernyms of hatchet include arm, weapon.

hatchet (noun)	weapon system (noun)
a small ax with a short handle used with one hand (usually to chop wood)	any instrument or instrumentality used in fighting or hunting
weapon consisting of a fighting ax; used by North American Indians