use module hierarchy!

module_instead_alias.rb

# people write such a code

class Person
  def say(word)
    puts word
  end
end

class Person
  alias_method :old_say, :say
  def say(word)
    old_say(word.uppercase)
  end
end

#instead of this!
module Speaker
  def say(word)
    puts word
  end
end

class Person
  include Speaker
end

module LoudSpeaker
  def say(word)
    super(word.uppercase)
  end
end

class Person
  include LoudSpeaker
end