The difference between Complex and Tough

When used as nouns, complex means a problem, whereas tough means a person who obtains things by force.

When used as verbs, complex means to form a complex with another substance, whereas tough means to endure.

When used as adjectives, complex means made up of multiple parts, whereas tough means strong and resilient.

check bellow for the other definitions of Complex and Tough

Complex as an adjective:

Made up of multiple parts; composite; not simple.

Examples:

"a complex being; a complex idea"
Complex as an adjective:

Not simple, easy, or straightforward; complicated.
Complex as an adjective (mathematics):

Of a number, of the form a + bi, where a and b are real numbers and i is a square root of −1.

Examples:

"complex function"
Complex as an adjective (geometry):

A curve, polygon or other figure that crosses or intersects itself.

Complex as a noun:

A problem.
Complex as a noun:

A network of interconnected systems.

Examples:

"uxi [[military-industrial complex]]"
Complex as a noun:

A collection of buildings with a common purpose, such as a university or military base.
Complex as a noun:

An assemblage of related things; a collection.
Complex as a noun (psychology):

A psychological dislike or fear of a particular thing.

Examples:

"Jim has a real complex about working for a woman boss."
Complex as a noun:

An organized cluster of thunderstorms.
Complex as a noun (chemistry):

A structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules.
Complex as a noun (math):

A complex number.

Complex as a verb (chemistry, intransitive):

To form a complex with another substance
Complex as a verb (transitive):

To complicate.

Tough as an adjective:

Strong and resilient; sturdy.

Examples:

"The tent, made of tough canvas, held up to many abuses."
Tough as an adjective (of food):

Difficult to cut or chew.

Examples:

"To soften a tough cut of meat, the recipe suggested simmering it for hours."
Tough as an adjective:

Rugged or physically hardy.

Examples:

"Only a tough species will survive in the desert."
Tough as an adjective:

Stubborn.

Examples:

"He had a reputation as a tough negotiator."
Tough as an adjective (of weather etc):

Harsh or severe.
Tough as an adjective:

Rowdy or rough.

Examples:

"A bunch of the tough boys from the wrong side of the tracks threatened him."
Tough as an adjective (of questions, etc.):

Difficult or demanding.

Examples:

"This is a tough crowd."
Tough as an adjective (material science):

Undergoing plastic deformation before breaking.

Tough as a noun:

A person who obtains things by force; a thug or bully.

Examples:

"They were doing fine until they encountered a bunch of toughs from the opposition."