Is alike a word in the Scrabble Dictionary

Yes, alike is playable

...and is worth 10 points.

Found in the following dictionaries

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

"Alike" Definition

adjective

Having close resemblance; similar: The twins are as alike as two peas in a pod. Friends are generally alike in background and tastes.
Exhibiting close resemblance without being identical .

adverb

In the same manner or to the same degree: They dress and walk alike.
In the same manner, form, or degree .