The difference between Fight and Punch-up

When used as nouns, fight means an occasion of fighting, whereas punch-up means a fight with the fists.

Fight is also verb with the meaning: to contend in physical conflict, either singly or in war, battle etc.

check bellow for the other definitions of Fight and Punch-up

Fight as a verb (intransitive):

To contend in physical conflict, either singly or in war, battle etc.

Examples:

"A wounded animal will fight like a maniac, relentless, savage and murderous."
Fight as a verb (reciprocal):

To contend in physical conflict with each other, either singly or in war, battle etc.

Examples:

"The two boxers have been fighting for more than half an hour."
Fight as a verb (intransitive):

To strive for; to campaign or contend for success.

Examples:

"He fought for the Democrats in the last election."
Fight as a verb (transitive):

To conduct or engage in (battle, warfare etc.).

Examples:

"The battle was fought just over that hill."
Fight as a verb (transitive):

To engage in combat with; to oppose physically, to contest with.

Examples:

"My grandfather fought the Nazis in World War II."
Fight as a verb (transitive):

To try to overpower; to fiercely counteract.

Examples:

"The government pledged to fight corruption."
Fight as a verb (transitive, archaic):

To cause to fight; to manage or manoeuvre in a fight.

Examples:

"to fight cocks;&emsp; to fight one's ship"

Fight as a noun:

An occasion of fighting.

Examples:

"One of them got stuck in a chokehold and got stabbed to death during the fight."
Fight as a noun (archaic):

A battle between opposing armies.
Fight as a noun:

A physical confrontation or combat between two or more people or groups.

Examples:

"Watch your language, are you looking for a fight?"
Fight as a noun (sports):

A boxing or martial arts match.

Examples:

"I'm going to Nick’s to watch the big fight tomorrow night."
Fight as a noun:

A conflict, possibly nonphysical, with opposing ideas or forces; strife.

Examples:

"I'll put up a fight to save this company."
Fight as a noun (uncountable):

The will or ability to fight.

Examples:

"That little guy has a bit of fight in him after all. As soon as he saw the size of his opponent, all the fight went out of him."
Fight as a noun (obsolete):

A screen for the combatants in ships.