Spectare - to watch
1. Spectator      - One who looks on or watches
2. Spectacle      - Something exhibited to view as unusual
3. Spectacles     - Glasses 
4. Specimen      - a portion of material for testing, study
5. inspector       - a person appointed to oversee  
6. aspect           - appearance to the eye or mind
7. prospect        - an extensive view
8. circumspect   - to look around, be cautious