companion

A companion is one who serves as a friend or partner in something. Whether it’s travel or dinner or card-playing, your companion is the one who does it with you.

The word companion is a close, um, companion to the word company, and you might as well say that someone you keep company with is your companion. Sometimes, it describes a piece of art or other work that goes with another. For instance, you might read a biography of Emily Dickenson as a companion to her studying her poems. The things go together and complement each other.

Definitions of companion
1

n a friend who is frequently in the company of another

“drinking companions
Synonyms:
associate, comrade, familiar, fellow
Types:
show 4 types...
hide 4 types...
date, escort
a participant in a date
playfellow, playmate
a companion at play
tovarich, tovarisch
a comrade (especially in Russian communism)
blind date
a participant in a blind date (someone you meet for the first time when you have a date with them)
Type of:
friend
a person you know well and regard with affection and trust

n a traveler who accompanies you

Synonyms:
fellow traveler, fellow traveller
Type of:
traveler, traveller
a person who changes location

n one paid to accompany or assist or live with another

Type of:
attendant, attender, tender
someone who waits on or tends to or attends to the needs of another

v be a companion to somebody

Synonyms:
accompany, company, keep company
Type of:
affiliate, associate, assort, consort
keep company with; hang out with

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