apothegm, tapeworm, thallium
Piercing.
ExpressoFalsettoFandango.
Hanukkah
Question.
astonish
linguini
apparentaffluentrepresent
Copious
Olympiad
avoidingbreakingcrawlingdrinkingenduringfloatingguessinghumoringinvitinglisteningmountingnoticingorderingpressingprintingquittingroastingstealingtreadingunendingvouchingwateringyielding
Horologe is the word you are looking for.A horologe is a timekeeping device, such as a clock or a watch.You would pronounce this noun as HOR-ah-loj.
One example of an 8-letter word ending with "ing" is "starting." It refers to the act of beginning something or initiating a process.