The difference between Defeat and Worsen

When used as verbs, defeat means to overcome in battle or contest, whereas worsen means to make worse.

Defeat is also noun with the meaning: the act or instance of defeating, of overcoming, vanquishing.

check bellow for the other definitions of Defeat and Worsen

Defeat as a verb (transitive):

To overcome in battle or contest.

Examples:

"Wellington defeated Napoleon at Waterloo."
Defeat as a verb (transitive):

To reduce, to nothing, the strength of.
Defeat as a verb (transitive):

To nullify

Defeat as a noun:

The act or instance of defeating, of overcoming, vanquishing.

Examples:

"The inscription records her defeat of the country's enemies in a costly war."
Defeat as a noun:

The act or instance of being defeated, of being overcome or vanquished; a loss.

Examples:

"Licking their wounds after a temporary defeat, they planned their next move."
Defeat as a noun (legal):

Frustration (by prevention of success), stymieing; nullification.
Defeat as a noun (obsolete):

Destruction, ruin.

Worsen as a verb (transitive):

To make worse; to impair.

Examples:

"The global warming has worsened the weather."
Worsen as a verb (intransitive):

To become worse; to get worse.

Examples:

"The weather has worsened."
Worsen as a verb (transitive, obsolete):

To get the better of; to worst.