push back vs offence

push back and offence both are nouns.

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

As nouns, offence is a hypernym of push back; that is, offence is a word with a broader meaning than push back:

Other hypernyms of push back include offense, offensive.

push back (noun)	offence (noun)
the act of forcing the enemy to withdraw	the action of attacking an enemy
	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

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