1. unnecessary not needed
  2. necessary absolutely essential
  3. ensure make certain of
  4. unnecessarily without any necessity
  5. ancillary furnishing added support
  6. agnostic a person who claims the existence of God is unknowable
  7. incisor a tooth for cutting or gnawing
  8. incessant uninterrupted in time and indefinitely long continuing
  9. incisura (anatomy) a notch or small hollow
  10. incisure (anatomy) a notch or small hollow
  11. ancestor someone from whom you are descended
  12. accessary someone who helps another person commit a crime
  13. necessarily in such a manner as could not be otherwise
  14. ancestry the lineage of an individual
  15. accessory a supplementary component that improves capability
  16. Insessores a bird with feet adapted for perching
  17. insidious working or spreading in a hidden and usually injurious way
  18. concession the act of yielding
  19. wine cellar storage space where wines are stored
  20. insure protect by a contract of reimbursement in case of loss