Yes, knew is a Scrabble word!

Verb

1. Be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about

2. Know how to do or perform something

3. Be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt

4. Be familiar or acquainted with a person or an object

5. Have firsthand knowledge of states, situations, emotions, or sensations

6. Accept (someone) to be what is claimed or accept his power and authority

7. Have fixed in the mind

8. Have sexual intercourse with

9. Know the nature or character of

10. Be able to distinguish, recognize as being different

11. Perceive as familiar