tail vs tailing

tail and tailing both are nouns.

Word	Noun	Adjective	Verb	Adverb
tail	Yes	No	Yes	No
tailing	Yes	No	No	No

tail (noun)	tailing (noun)
the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body	the act of following someone secretly
the rear part of a ship
the rear part of an aircraft
(usually plural) the reverse side of a coin that does not bear the representation of a person's head
the fleshy part of the human body that you sit on
a spy employed to follow someone and report their movements
any projection that resembles the tail of an animal
the time of the last part of something

tail (verb)	tailing (verb)
remove or shorten the tail of an animal
remove the stalk of fruits or berries
go after with the intent to catch