Yes, echo is a Scrabble word!
...and is worth 9 points in Scrabble, and 9 points in Words with Friends
echo
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
What Scrabble words can I make with the letters in echo?
3 Letter Words
2 Letter Words