Yes, slip is a Scrabble word!

Verb

1. Move stealthily

2. Insert inconspicuously or quickly or quietly

3. Move obliquely or sideways, usually in an uncontrolled manner

4. Get worse

5. Move smoothly and easily

6. To make a mistake or be incorrect

7. Pass on stealthily

8. Move easily

9. Cause to move with a smooth or sliding motion

10. Pass out of one's memory

11. Move out of position

Noun

1. A socially awkward or tactless act

2. A minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.

3. Potter's clay that is thinned and used for coating or decorating ceramics

4. A part (sometimes a root or leaf or bud) removed from a plant to propagate a new plant through rooting or grafting

5. A young and slender person

6. A place where a craft can be made fast

7. An accidental misstep threatening (or causing) a fall

8. A slippery smoothness

9. Artifact consisting of a narrow flat piece of material

10. A small sheet of paper

11. A woman's sleeveless undergarment

12. Bed linen consisting of a cover for a pillow

13. An unexpected slide

14. A flight maneuver; aircraft slides sideways in the air

15. The act of avoiding capture (especially by cunning)