class_and_constants.rb

class Cat
  def make_sound
    'meow'
  end
end

# Anonymous classes assigned to a constant get the name of that constant
klass = Class.new do
  def make_sound
    'woof'
  end
end

Dog = klass
Wolf = klass

Cat # => Cat
Dog # => Dog
Wolf # => Dog

# Duping/cloning an instance of a class before assigning allows you to assign
# it to multiple constant names
klass = Class.new do
  def make_sound
    'woof'
  end
end

Dog = klass.dup
Wolf = klass.dup

Cat # => Cat
Dog # => Dog
Wolf # => Wolf

Cat.new.make_sound # => "meow"
Dog.new.make_sound # => "woof"
Wolf.new.make_sound # => "woof"