Here is a version that adds your method to Array. Simplifies the overall usage and allows reuse wherever you like.

resorted.rb

class Array
  def wordlen_sort
    replacement_array = []
    unsorted_array = self.dup
    while unsorted_array.count >= 2
      temp = unsorted_array.shift
      counter = unsorted_array.count
    
      unsorted_array.cycle(counter) do |word|
        if temp.length < word.length
          temp = temp
        elsif temp.length > word.length
          unsorted_array << temp
          temp = unsorted_array.shift
        end
      end
      replacement_array << temp 
    end
  
    if unsorted_array.count < 2
     replacement_array << unsorted_array.first  
    end
    
    self.clear
    self << replacement_array 
    self.flatten
  end
end
 
def create_array
  puts "Type as many words as you want to create an array."
  puts "Just press enter in a blank gets to exit"
  
  one_array = []
  while true  
    input = gets.chomp
    one_array << input
    if input == ''
      one_array.pop
      break
    end
  end
  puts "Your unsorted array: #{one_array} "
  return one_array
end
  
create_array
puts
puts "Your sorted array #{empty_array.wordlen_sort}" # the returned value shows up here.

oh cool, thanks kevin. I'm just now learning about making my own class' so this is very helpful!