As verbs the difference between fight and oppugn

is that fight is to contend in physical conflict, either singly or in war, battle etc while oppugn is to contradict or controvert; to oppose; to challenge or question the truth or validity of a given statement.

As a noun fight

is an occasion of fighting.

Painful is a related term of fiery.

As adjectives the difference between painful and fiery

is that painful is causing pain or distress, either physical or mental while fiery is of or relating to fire.

Undefined is a related term of uncertain.

As adjectives the difference between undefined and uncertain

is that undefined is lacking a definition or value while uncertain is not certain; unsure.

As adjectives the difference between untaught and uninformed

is that untaught is not taught while uninformed is not informed; ignorant.

Remunerate is a related term of punish.

As verbs the difference between remunerate and punish

is that remunerate is to compensate; to pay while punish is to cause to suffer for crime or misconduct, to administer disciplinary action.

Delay is a related term of embarrass.

As verbs the difference between delay and embarrass

is that delay is to put off until a later time; to defer or delay can be (obsolete) to dilute, temper while embarrass is to humiliate; to disrupt somebody's composure or comfort with acting publicly or freely; to disconcert; to abash.

As a noun delay

is a period of time before an event occurs; the act of delaying; procrastination; lingering inactivity.

Obstruction is a related term of perplexity.

As nouns the difference between obstruction and perplexity

is that obstruction is the act of obstructing, or state of being obstructed while perplexity is the state or quality of being perplexed; puzzled or confused.

Plot is a related term of tract.

As nouns the difference between plot and tract

is that plot is the course of a story, comprising a series of incidents which are gradually unfolded, sometimes by unexpected means while tract is an area or expanse.

As verbs the difference between plot and tract

is that plot is to conceive (a crime, etc) while tract is (obsolete) to pursue, follow; to track.

As verbs the difference between frowning and violent

is that frowning is present participle of lang=en while violent is to urge with violence.

As nouns the difference between frowning and violent

is that frowning is the act of giving a frown while violent is an assailant.

As an adjective violent is

involving extreme force or motion.

As adjectives the difference between violent and heady

is that violent is involving extreme force or motion while heady is intoxicating or stupefying.

As a verb violent

is to urge with violence.

As a noun violent

is an assailant.