The difference between Couple and Few

When used as determiners, couple means two or a few, a small number of, whereas few means an indefinite, but usually small, number of.

Couple is also noun with the meaning: two partners in a romantic or sexual relationship.

Couple is also verb with the meaning: to join (two things) together, or (one thing) to (another).

Couple is also adjective with the meaning: two or (a) small number of.

Few is also pronoun with the meaning: few people, few things.

check bellow for the other definitions of Couple and Few

Couple as a noun:

Two partners in a romantic or sexual relationship.
Couple as a noun:

Two of the same kind connected or considered together.
Couple as a noun (informal):

A small number.
Couple as a noun:

One of the pairs of plates of two metals which compose a voltaic battery, called a voltaic couple or galvanic couple.
Couple as a noun (physics):

Two forces that are equal in magnitude but opposite in direction (and acting along parallel lines), thus creating the turning effect of a torque or moment.
Couple as a noun (architecture):

A couple-close.
Couple as a noun (obsolete):

That which joins or links two things together; a bond or tie; a coupler.

Couple as a verb (transitive):

To join (two things) together, or (one thing) to (another).

Examples:

"Now the conductor will couple the train cars."

"I've coupled our system to theirs."
Couple as a verb (transitive, dated):

To join in wedlock; to marry.
Couple as a verb (intransitive):

To join in sexual intercourse; to copulate.

Few as a pronoun:

Few people, few things.

Examples:

"Many are called, but few are chosen."