Yes, slip is playable
...and is worth 8 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Slip" Definition
noun
A long narrow piece; a strip.
A narrow pew in a church.
A part of a plant cut or broken off for grafting or planting; a scion or cutting.
verb
To take cuttings from (a plant) divide into .
To avoid (a punch) by moving the body or head quickly to one side.
To transfer (a stitch) from one needle to another without working a stitch.
To insert, place, or pass quietly or secretly.
To give or pay on the sly.
idiom
Give (someone) the slip Slang To escape the pursuit of.
Let slip To say inadvertently.
Slip one over on Informal To hoodwink; trick.
verb-transitive
To cause to move in a smooth, easy, or sliding motion: slipped the bolt into place.
To get loose or free from; elude.
To give birth to prematurely. Used of animals.
To make a slip from (a plant or plant part).
verb-intransitive
To decline from a former or standard level; fall off.
To escape, as from a grasp, fastening, or restraint: slipped away from his pursuers.
To fall behind a scheduled production rate.
To fall into fault or error. Often used with up.
To move smoothly, easily, and quietly: slipped into bed.
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