Common Words:
* Fiddle
* Fidelity
* Confide
* Infidel
Less Common Words:
* Fiduciary
* Difficulties
* Confidant
* Fiducial
* Fidicinal
Technical Terms:
* Fidiculus (a type of mite)
* Fidium (a unit of electric charge)
Let me know if you'd like me to find words with a different combination of letters!