Yes, top is a Scrabble word!

Verb

1. Be superior or better than some standard

2. Pass by, over, or under without making contact

3. Be at the top of or constitute the top or highest point

4. Be ahead of others; be the first

5. Provide with a top or finish the top (of a structure)

6. Reach or ascend the top of

7. Strike (the top part of a ball in golf, baseball, or pool) giving it a forward spin

8. Cut the top off

9. Be the culminating event

10. Finish up or conclude

Adjective

1. Situated at the top or highest position

Noun

1. The upper part of anything

2. The highest or uppermost side of anything

3. The top or extreme point of something (usually a mountain or hill)

4. The first half of an inning; while the visiting team is at bat

5. The highest level or degree attainable; the highest stage of development

6. The greatest possible intensity

7. Platform surrounding the head of a lower mast

8. A conical child's plaything tapering to a steel point on which it can be made to spin

9. Covering for a hole (especially a hole in the top of a container)

10. A garment (especially for women) that extends from the shoulders to the waist or hips

11. A canvas tent to house the audience at a circus performance