Borrowed from Latin appendix.
appendix (plural appendices or appendixes)
You can also try words with the phrase APPENDIX, words starting with the letters APPENDIX, or words ending in the letters APPENDIX.
Words… ending with q, starting with q, starting with qa, starting with qo, with two letters, starting with x, starting with j, ending with j,
Some random searches:
GEWB, NUELIWU, CAEOU, NYGONIT, NHIH, IZMAK,