Colleague
Coworker
noun
We work at the same place and are colleagues, making us colleagues or coworkers.
As you might guess from the 同 kanji, 同僚 generally refers to people working in the same workplace with the same rank or status. In other words, you wouldn't usually call your boss your 同僚!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
こちらは同僚の林さんです。
This is my colleague, Hayashi-san.
オレの同僚は冷たいヤツなんだよ。
My colleague is a cold-hearted man.
困ったときに相談できるような上司や同僚だったら良かったんだけどね。
It would have been nice to have a boss or colleagues to turn to for advice when there was trouble.