tranquility vs tranquil

tranquility is a noun but tranquil is not a noun.

Word	Noun	Adjective	Verb	Adverb
tranquility	Yes	No	No	No
tranquil	No	Yes	No	No

tranquility (noun)	tranquil (noun)
a disposition free from stress or emotion
a state of peace and quiet
an untroubled state; free from disturbances

tranquility (adjective)	tranquil (adjective)
	(of a body of water) free from disturbance by heavy waves
	not agitated; without losing self-possession