There are 26 possibilities.
What is the first letter of a five letter word meaning "pace"?
The first letter is L.
Flush could be the word.
Thousands of five letter words appear in the dictionary prior to hint. Aaron is the "first" five letter word in the dictionary.
The first letter of a five letter word meaning big incentive pay received by a salesperson is 'B' for the word bonus.
Gourd.
Event.
T
l for large
queue
nannyninjaninth
f for flush