gabbroic
guess
maudlin, motley
macerate
Baathist
daffy
str
Thousands of five letter words appear in the dictionary prior to hint. Aaron is the "first" five letter word in the dictionary.
if you look in the dictionary the answer is consul
'a' being the first letter of the English alphabet
The capital letter 'A' is the first noun in most dictionaries.
The first word in an English dictionary is 'a', the indefinite article. probably aardvark as it has 2 "a"s at the beginning
Signal
liner