vigor

As nouns the difference between vigor and tough

is that vigor is while tough is a person who obtains things by force; a thug or bully.

As an adjective tough is

strong and resilient; sturdy.

As an interjection tough is

(slang) (used to indicate lack of sympathy).

As a verb tough is

to endure.

As nouns the difference between vigor and strength

is that vigor is an alternative spelling of from=US|lang=en while strength is the quality or degree of being strong.

As a verb strength is

to give strength to; to strengthen.

As nouns the difference between endurance and vigor

is that endurance is the measure of a person's stamina or persistence while vigor is an alternative spelling of from=US|lang=en.

As a noun vigor

is .

As an adjective adynamic is

not dynamic; without strength or vigor.

As a noun vigor

is an alternative spelling of from=US|lang=en.

As a verb succuss is

to shake with vigor.