The difference between Affix and Couple

When used as nouns, affix means that which is affixed, whereas couple means two partners in a romantic or sexual relationship.

When used as verbs, affix means to attach, whereas couple means to join (two things) together, or (one thing) to (another).

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.

check bellow for the other definitions of Affix and Couple

Affix as a noun:

That which is affixed; an appendage.
Affix as a noun (linguistic morphology):

A bound morpheme added to the word's stem's end.
Affix as a noun (linguistic morphology):

A bound morpheme added to a word's stem; the term comprises prefixes, suffixes, infixes, circumfixes, and suprafixes.
Affix as a noun (mathematics):

The complex number a+bi associated with the point in the Gauss plane with coordinates (a,b).
Affix as a noun (decorative art):

Any small feature, as a figure, a flower, or the like, added for ornament to a vessel or other utensil, to an architectural feature.

Affix as a verb (transitive):

To attach.

Examples:

"to affix a stigma to a person; to affix ridicule or blame to somebody"
Affix as a verb (transitive):

To subjoin, annex, or add at the close or end; to append to.

Examples:

"to affix a syllable to a word; to affix a seal to an instrument; to affix one's name to a writing"
Affix as a verb (transitive):

To fix or fasten figuratively; with on or upon.

Examples:

"eyes affixed upon the ground"

"rfquotek Edmund Spenser"

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.