Word Pruning by Letter Subtraction

subtract_letters.rb

possible_words = ["seek", "find", "ignore", "pursue", "covet"]
available_letters = ["a", "c", "e", "f", "g", "i", "n", "o", "p", "r", "t", "u", "v"]

words = Array[possible_words].flatten
available_letters.each {|e| words = words.map {|w| w.sub(e, '')}}

viable_words = words.each_with_index.collect {|w,k| possible_words[k] if w==""}.compact

Okay so I think the next move is to create an array of hashes of the letters and their values that matches each word and then we can use that later in the board.

word_as_hash = Array.new
viable_words.each do |word|
i = 0
x = word.size
while x > i
word_as_hash << word[i].to_sym
i += 1
end
end

okay so that successfully changes each character to a hash but doesn't keep the words as separate arrays. Ideas?