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"Good night" is a form of "good night", a phrase which is often translated as "buenas noches". "My dear" is a phrase which is often translated as "querido". Learn more about the difference between "my dear" and "good night" below.
my dear(
may
 
dir
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. querido (said to a man)
I can't wait to see you, my dear!¡No puedo esperar para verte, querido!
b. querida (said to a woman)
My dear, I can't think of anyone more thoughtful than you.Querida, no puedo imaginar alguien más amable que tú.
c. cariño
My dear, you are so kind.Cariño, eres tan generosa.
d. tesoro
I love you, my dear.Te amo, tesoro.
e. cielo
I'm so happy to see you, my dear.Me alegra verte, cielo.
a. mi querido
My dear friend, what you're saying is foolishness.Mi querido amigo, lo que dices es una tontería.
b.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Lauren is my dear friend whom I met in Los Angeles.Lauren es mi amiga entrañable a quien conocí en Los Ángeles.
Tomorrow I am going to visit my dear friend John.Mañana voy a visitar a mi amigo íntimo John.
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good night(
good
 
nayt
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. buenas noches
Go to sleep! Good night!¡Duérmete! ¡Buenas noches!
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