gistfile1.rb

def to_i(w)
  r = 0

  w.each_char { |ch| r = r | (1 << ch.ord - 96) }

  r
end

@dict_word_letters = {}

f = File.open('wl.txt')

f.each_line do |word|
  word = word.strip
  @dict_word_letters[word] = to_i(word)
end

def anagrams(word)
  res = []
  wh = to_i(word)
  @dict_word_letters.each do |w, h|
    res << w if wh == h && w.length == word.length && w.chars.sort == word.chars.sort
  end
  res
end

puts anagrams('horse')