Fa is a noun. It is the 4th note of the music scale. It begins with the letter f.
Some Halloween words beginning with F are:funfairiesfudgefirelightfrightfulfavorsfall
Furious
Fork.
foul
flaccid
foxy
One word that starts with "F" that describes a leader is Fair.
feature
flyleaf
faults
flesh ?
Festival, fair