Nightkin 

Super Mutants found in Fallout: New Vegas that can go invisible due to excessive experimentation with stealth boys.

Damn that Nightkin really got, me!
He was invisible so I couldn't see it!

Nightkin by Sarged January 25, 2011

Nightingale 

No nightingales

Listen do you hear that ?
I don’t hear anything

That’s the point….no nightingales

Blah blah

*every*

Nightingale by LlamaUrMother September 7, 2023

Nightskin 

Formerly a term of offense used against blacks, now used in reference to a powerful race of dark skinned individuals. It was first brought to light by tiktok user @tonyweaverjr, who piloted a reclamation of the word and incited the start of an entire community of writers, artists, musicians, and others who create empowering content for the fictional universe.

I am the Ebony Warrior, leader of the Dark Brotherhood. I call upon my nightskin brothers and sisters. Our time is now.

Nightskin by JN3XUS May 2, 2022

Nightwing 

The original Robin, also known as Dick Grayson.
Quite possibly the coolest part of the Batman everything.
Nightwing is a badass mofo with long black hair and ninja moves. Very shweet!

Dude 1: Dude! Batman is on! Let's watch!

Dude 2: Is it the one with Nightwing?!?

Dude 1:...No.

Dude 2: Well fuck that then!

Nightwing by Josh-o-matic December 16, 2008

Nightingale syndrome 

The Florence Nightingale effect is a situation where a caregiver develops romantic feelings for their patient. Many often misunderstand the term to mean the opposite; that is, a patient falling in love with the caregiver as a result of interpreting an amiable bedside manner as affection.

See Florence_Nightingale_effect on Wikipedia, often confused with Nightingale syndrome (which is something else entirely).

Nightingale syndrome by Walkman100 January 19, 2016

Nightingale Pasta 

A phrase that is used when more than one neighbors sexual activities can be heard at the same time, giving the impression that a nightingale is dying in boiling agony. The common response to this layer of awkwardness is to eat pasta.

I swear all my neighbors were going at it last night...so I had to bust out the old nightingale pasta cuz I don't have a girlfriend.

Nightingale Pasta by KosherBob January 4, 2021

Nightingale 

Beautiful woman that has eyes of a godess amazing singer, falls deep loves hard is family orientated , dosent have a bad bone in her a really amazing kisser , all nightingale's tend to be incredibly gorgeous with the most flawless skin , but watch out for her short wick temper Everybody needs a nightingale

Nightingales are keepers

Nightingale by Jane webb December 17, 2013