tran·quil·i·ty or tran·quil·li·ty 
(trăng-kwĭlĭ-tē, trăn-)
(trăng-kwĭlĭ-tē, trăn-)n.
The quality or state of being tranquil; serenity.
- disputatious
- disputatiously
- disputatiousness
- dispute
- disputer
- disqualification
- disqualify
- disquiet
- disquietingly
- disquietly
- disquietude
- disquisition
- Disraeli
- disrate
- disregard
- disregardful
- disrelish
- disremember
- disrepair
- disreputability
- disreputable
- disreputableness
- disreputably
- disrepute
- disrespect