Yes, bug is a Scrabble word!

Verb

1. Annoy persistently

2. Tap a telephone or telegraph wire to get information

Noun

1. General term for any insect or similar creeping or crawling invertebrate

2. A fault or defect in a computer program, system, or machine

3. A small hidden microphone; for listening secretly

4. Insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis

5. A minute life form (especially a disease-causing bacterium); the term is not in technical use