Nemeses 

Plural form of nemesis, meanig enemies or rivals. Can also be used after "arch-", meaning that someone/something is your worst enemy.

Not to be confused with "nemesi", which is not an actual word.

Rich and Don are my nemeses, because everywhere I go those two are always one-upping me.

Nemeses by Rodney Basil July 8, 2004

Nemesia

Nemesia is a girl’s name, Nemesia is not a common name but they are an old Greek name translated to goddess of vengeance. They are nice, sweet, loving, special, loyal, clean, organized, beautiful, pretty, caring and amazing(and way more). They will be there for you through thick and thin. Even if you aren’t close to each other like you used to be, they will find ways to make sure that wherever your going, your safe. They will also find time just for you. They will talk to you no matter how long or how far away you are from each other. They will truly be your guardian angel from birth to death. They will love you no matter what you look like and they won’t stop loving you.. Nemesia’s are there for u no matter what and I love them❤️

Person 1: i met this amazing and special

Person 2: me too is her name nemesia
Person 1: Yea! I love her

Nemesia by xoxolyt May 27, 2019

Nemesex

The act of having sex with someone you hate

I had nemesex with her. I can't stand her but the is great!

Nemesex by Berm Beavers August 2, 2009

nemesary 

the biggest competitor and/or enemy anyone can ever face

The Boston Red Sox glared across the ball diamond at dusk, for there in the shadow of the blimp stood their biggest nemesary: The New York Yankees

nemesary by Sandy Sharkey September 2, 2005