offense vs push back

offense and push back both are nouns.

Word	Noun	Adjective	Verb	Adverb
offense	Yes	No	No	No
push back	Yes	No	Yes	No

As nouns, push back is a hyponym of offense; that is, push back is a word with a more specific, narrower meaning than offense:

Other hyponyms of offense include counteroffensive, dirty war, rollback.

offense (noun)	push back (noun)
the action of attacking an enemy	the act of forcing the enemy to withdraw
a transgression that constitutes a violation of what is judged to be right
a lack of politeness; a failure to show regard for others; wounding the feelings of others
a feeling of anger caused by being offended
the team that has the ball (or puck) and is trying to score

offense (verb)	push back (verb)
	cause to move back by force or influence