Yes, thread is a Scrabble word!

Verb

1. To move or cause to move in a sinuous, spiral, or circular course

2. Pass a thread through

3. Remove facial hair by tying a fine string around it and pulling at the string

4. Pass through or into

5. Thread on or as if on a string

Noun

1. A fine cord of twisted fibers (of cotton or silk or wool or nylon etc.) used in sewing and weaving

2. Any long object resembling a thin line

3. The connections that link the various parts of an event or argument together

4. The raised helical rib going around a screw