flamethrower vs weapon system

flamethrower and weapon system both are nouns.

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

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

flamethrower: a weapon that squirts ignited fuel for several yards
weapon system: any instrument or instrumentality used in fighting or hunting

Other hypernyms of flamethrower include arm, weapon.

flamethrower (noun)	weapon system (noun)
a weapon that squirts ignited fuel for several yards	any instrument or instrumentality used in fighting or hunting