The word tranquility, like all words that end with -ity, is a noun.
The address of the Tranquillity Station is: 25561 W Williams St, Tranquillity, 93668 M
The phone number of the Tranquillity Station is: 559-698-5158.
Dark Tranquillity was created in 1989.
The tranquillity of the night was spoiled when the traffic started coming through the village.
Peacefulness.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.