The difference between Couple and Item

When used as nouns, couple means two partners in a romantic or sexual relationship, whereas item means a distinct physical object.

When used as verbs, couple means to join (two things) together, or (one thing) to (another), whereas item means to make a note of.

Couple is also determiner with the meaning: two or a few, a small number of.

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

Item is also adverb with the meaning: likewise.

check bellow for the other definitions of Couple and Item

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.

Item as a noun:

A distinct physical object.

Examples:

"Tweezers are great for manipulating small items."
Item as a noun (by extension, video games):

An object that can be picked up for later use.
Item as a noun:

A line of text having a legal or other meaning; a separate particular in an account.

Examples:

"the items in a bill"

"In response to the first item, we deny all wrongdoing."
Item as a noun (psychometrics):

A question on a test, which may include its answers.

Examples:

"The exam has 100 items, each of which includes a correct response and three distractors."
Item as a noun:

A matter for discussion in an agenda.

Examples:

"The first item for discussion is the budget for next year's picnic."
Item as a noun (informal):

Two people who are having a relationship with each other.

Examples:

"Jack and Jill are an item."
Item as a noun:

A short article in a newspaper.

Examples:

"an item concerning the weather"
Item as a noun (obsolete):

A hint; an innuendo.