military strength vs military posture

military strength and military posture both are nouns.

Word	Noun	Adjective	Verb	Adverb
military strength	Yes	No	No	No
military posture	Yes	No	No	No

As nouns, military strength and military posture are synonyms defined as:

military strength and military posture: capability in terms of personnel and materiel that affect the capacity to fight a war

Other synonyms of military strength include military capability, posture, strength.

military strength (noun)	military posture (noun)
capability in terms of personnel and materiel that affect the capacity to fight a war	capability in terms of personnel and materiel that affect the capacity to fight a war