Yes, ready is a Scrabble word!

Verb

1. Prepare for eating by applying heat

2. Make ready or suitable or equip in advance for a particular purpose or for some use, event, etc

Adjective

1. Completely prepared or in condition for immediate action or use or progress

2. (of especially money) immediately available

3. Mentally disposed

4. Made suitable and available for immediate use

5. Apprehending and responding with speed and sensitivity

Noun

1. Poised for action