Yes, echo is a Scrabble word!

Verb

1. To say again or imitate

2. Ring or echo with sound

3. Call to mind

Noun

1. The repetition of a sound resulting from reflection of the sound waves

2. (Greek mythology) a nymph who was spurned by Narcissus and pined away until only her voice remained

3. A reply that repeats what has just been said

4. A reflected television or radio or radar beam

5. A close parallel of a feeling, idea, style, etc.

6. An imitation or repetition