伴侣用英语高级词汇怎么说

In English, a "companion" is a person who spends a lot of time with another person and shares their activities. A more advanced word for a companion could be "confidant," which refers to a person with whom one shares a close relationship and trusts enough to confide in. Another word that could be used is "ally," which refers to a person who supports and helps another person, especially in times of need.
Here are some examples of how these words could be used in sentences:
She was his closest confidant, and he confided in her about all of his deepest thoughts and feelings.
He was her loyal ally and always had her back, no matter what challenges they faced.
They were the best of companions, always there for each other through thick and thin.