1. Halfpace –  A raised floor or dais or a platform or footpace at the top of steps.
2. Aerophobia – Fear of fresh air.
3. Impignorate –  Pledge, pawn, mortgage.
4. Myrmecophobia – Fear of ants.
5. Jentacular – Pertaining to breakfast.
6. Numerophobia – Fear of numbers.
7. Quire – Four sheets of paper or parchment folded to form eight leaves, as in medieval manuscripts.
8. Phonophobia – Fear of sound. 
9. Yarborough – A hand with no card above a nine. (In bridge or whist)
10. Ombrophobia – Fear of rain.
11. Nudiustertian – Relating to the day before yesterday.
12. Neophobia – Fear of new things.
13. Hornswoggle – Get the better of (someone) by cheating or deception.
14. Eisoptrophobia – Fear of mirrors. 
15. Tittynope –  A small quantity of anything left over.

Citations:

https://www.prevention.com/health/mental-health/g20158616/weird-phobias/?slide=2

https://culturesconnection.com/unusual-words-in-english/

https://www.forbes.com/sites/shephyken/2021/10/03/choose-your-words-wisely-the-right-words-matter/?sh=38855cd5f492