companion
US /kəmˈpæn.jən/
UK /kəmˈpæn.jən/

1.
compagno, amico, socio
a person or animal with whom one spends a lot of time or with whom one travels
:
•
She found a loyal companion in her dog.
Ha trovato un fedele compagno nel suo cane.
•
He was a pleasant travel companion.
Era un piacevole compagno di viaggio.