overmighty

As a noun terms

is .

As an adjective overmighty is

excessively mighty.

As adjectives the difference between mighty and overmighty

is that mighty is very strong; possessing might while overmighty is excessively mighty.

As a noun mighty

is influential, powerful beings or mighty can be (obsolete|rare) a warrior of great strength and courage.

As an adverb mighty

is (colloquial) very; to a high degree.