The term 'most ancient' can be described by three crossword solutions: hoariest (8 letters), OLDEST (6 letters), and EARLIEST (8 letters). Hoariest is an adjective meaning very old or ancient, while OLDEST and EARLIEST both refer to the age of something, with OLDEST indicating the longest period of time and EARLIEST referring to the first in a sequence of events. All three words describe something that has been around for a long time and is considered to be very old.