Friendships cross generations. One schedules time to see friends. Americans act friendly. Contrasting A friend is someone with whom one is very close. A friendship embraces the whole person.
Friends gather just to be together.
Someone with a problem goes to a friend or family member for help at any time. One tolerates a lot from someone who is a friend. Friendships are only with the same gender. Friendships are with people of the same age. Friends are available at any time.