People who thwart other people could be called opponents, or obstacles.
Some call it a sandwich others call it a 'buttie'.
Some call a line of people a "queue" (pron. kyew). Others just call it a line.
Some people call it the pin, and others call it the stick.
Thwart means to confound, foil a plan beat someone or to run transversely across. I must thwart the villain in his plans. The seating ran thwart ships across the boat.
Some people refer to them as "gijinka", others call them "Pokemorphs". There are a few that just call them "Pokemon People".
Many people call it different things. Some people call it a swim meet. Others call them a swimming competition.
Altruists ,
Some southerners from the US call people from the north Northerners while there are some that call them Yankees. Others simply call them by their first name.
aid, assist, encourage are all antonyms for thwart
The word is thwart (prevent someone from doing something).
A thwart is a seat across a boat for a rower to sit on.
the people who you work for are bosses or employers, therefore you are the employee.