Is hackle a word in the Scrabble Dictionary

Yes, hackle is playable

...and is worth 16 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Hackle" Definition

noun

A hackle fly.
A tuft of cock feathers trimming an artificial fishing fly.
Any of the long, slender, often glossy feathers on the neck of a bird, especially a male domestic fowl.
The erectile hairs along the back of the neck of an animal, especially of a dog.
One of the long narrow feathers on the neck or saddle of a bird.

verb-transitive

To chop roughly; mangle by hacking.
To trim (an artificial fishing fly) with a hackle.

verb-intransitive

To hack.

verb

To comb out with a hackle.