anagram_grouper.rb

# Using instance method
#
class AnagramGrouper
  def group(words)
    # logic to group anagrams
  end
end

AnagramGrouper.new.group(%w(word another bob))

# Using class method (singleton)
#
class AnagramGrouper
  def self.group(words)
    # logic to group anagrams
  end
end

AnagramGrouper.group(%w(word another bob))