noun
fellow worker; colleague
A somewhat formal or written term for someone who works together with you, often in the same organization or on the same task.
彼は私の同労者として長年一緒に働いてきた。
He has worked with me for many years as a fellow worker.
Compound of 同 (same) + 労 (labor) + 者 (person). The exact historical derivation is uncertain, but the spelling conventionally means 'person of the same labor'.