The difference between Hackle and Heckle

Hackle as a noun:

An instrument with steel pins used to comb out flax or hemp.

Hackle as a noun (usually, now, _, in the plural):

One of the long, narrow feathers on the neck of birds, most noticeable on the rooster.

Hackle as a noun (fishing):

A feather used to make a fishing lure or a fishing lure incorporating a feather.

Hackle as a noun (usually, now, _, in the plural):

By extension (because the hackles of a rooster are lifted when it is angry), the hair on the nape of the neck in dogs and other animals; also used figuratively for humans.

Hackle as a noun:

A plate with rows of pointed needles used to blend or straighten hair.

Hackle as a noun:

A feather plume on some soldier's uniforms, especially the hat or helmet.

Hackle as a noun:

Any flimsy substance unspun, such as raw silk.

Hackle as a verb:

To dress (flax or hemp) with a hackle; to prepare fibres of flax or hemp for spinning.

Hackle as a verb (transitive):

To separate, as the coarse part of flax or hemp from the fine, by drawing it through the teeth of a hackle or hatchel.

Hackle as a verb (archaic, transitive):

To tear asunder; to break into pieces.

Heckle as a verb (transitive):

To question harshly in an attempt to find or reveal weaknesses.

Heckle as a verb (transitive):

To insult, tease, make fun of or badger.

Heckle as a verb (textiles):

To prepare flax for spinning using special combs called hackles

Heckle as a noun:

Heckle as a noun:

The long shining feathers on a cock's neck.

Heckle as a noun:

A feather ornament in the full-dress bonnets of Highland regiments.