Companionship is the state of being friends. It is a closeness or familiarity, a true fellowship among people who for some reason feel connected. It may refer to life-long partners. You may experience companionship with your best friend or romantic partner, or maybe even with your siblings. A feeling of fellowship or togetherness is companionship.
the different types of companionship may include lovers, platonic relationships, acquaintances, friends, soul-mates, team mates, family
Well, there's camaraderie, which I believe is a relationship with brothers-in-arms (army, navy people, etc), obviously romantic relationships, platonic relationships, etc..
"Scott failed his chemistry exam because he went out with his friends last night." This has a subordinating conjunction because the word 'because' shows a relationship between the two sentences.
