This is the 745th most frequent Spanish word.
compañero
"Compañero" means "companion" or "partner."
In this sentence, 'compañero' refers to a colleague or coworker— someone who shares the workplace.
Mi compañero de trabajo siempre llega temprano.
My coworker always arrives early.
Here, 'compañero' is used metaphorically to describe something that accompanies us, like a useful item during a trip.
Este libro es nuestro compañero de viaje indispensable.
This book is our indispensable travel companion.
In this case, 'compañero' refers to a significant other or partner, indicating a close personal relationship.