a person working with another or others

associate, fellow worker

trusted and loyal companion

ally

of the same kind, class etc; a man or a boy; a friend

male or female colleague, friend

a man; one of a pair of birds or animals; a ship's officer (not an engineer) below the rank of captain; a worker who helps another; (to cause birds or animals) to unite for the purpose of producing young

one of a pair; partner

a person who is equal in age, rank etc; (in GB) a member of one of the nobility, e.g. a duke, marquis, earl, viscount or baron

person who is another's equal