Create a new Dictionary with Dictionary.new. Then you can fill it with words and their corresponding definitions with the .new_words method. Put them in alphabetical order with .alpha and search the dictionary with .search. Create a new dictionary with .new_hash method.

dictionary.rb

class Dictionary
  attr_accessor :new_hash

  def initialize
    empty_hash = Hash.new
    @empty_hash = empty_hash
  end
    
  def new_words(new_hash)
    dictionary1 = @empty_hash.merge(new_hash)
    @dictionary1 = dictionary1
  end

  def alpha
    @dictionary1 = Hash[@dictionary1.sort]
  end

  def search(letters)
      @dictionary1.select {|word, defonition| word.include?(letters)}
  end
end

my_ditionary = Dictionary.new

puts "'#{my_ditionary.new_words({'cobalt'=>1,'adanine'=>2,'dimene'=>3,'boron'=>4})} should equal {'c'=>1,'a'=>2,'d'=>3,'b'=>4}"
puts "'#{my_ditionary.alpha} should equal {'c'=>1,'a'=>2,'d'=>3,'b'=>4}"
puts "'#{my_ditionary.search("co")} should equal {'cobalt'=>1}"
puts my_ditionary.new_hash=({1=>"a",2=>"b"})