Yes, secure is a Scrabble word!

Adjective

1. Free from fear or doubt; easy in mind

2. Free from danger or risk

3. Not likely to fail or give way

4. Immune to attack; incapable of being tampered with

5. Financially sound

Verb

1. Get by special effort

2. Cause to be firmly attached

3. Assure payment of

4. Make certain of

5. Fill or close tightly with or as if with a plug

6. Furnish with battens