firepower vs posture

firepower and posture both are nouns.

Word	Noun	Adjective	Verb	Adverb
firepower	Yes	No	No	No
posture	Yes	No	Yes	No

As nouns, posture is a hypernym of firepower; that is, posture is a word with a broader meaning than firepower:

firepower: (military) the relative capacity for delivering fire on a target
posture: capability in terms of personnel and materiel that affect the capacity to fight a war

Other hypernyms of firepower include military capability, military posture, military strength, strength.

firepower (noun)	posture (noun)
(military) the relative capacity for delivering fire on a target	the arrangement of the body and its limbs
	characteristic way of bearing one's body
	capability in terms of personnel and materiel that affect the capacity to fight a war
	a rationalized mental attitude

firepower (verb)	posture (verb)
	assume a posture as for artistic purposes
	behave affectedly or unnaturally in order to impress others