indexビューに検索機能を実装したいです。

２度目の質問です。現在Ruby on Rails で簡単な単語登録アプリを制作しています。
単語一覧のindex.html.hamlに単語検索機能を実装中ですが、下記のエラーが出ていて困っております。ご教授のほど、何卒宜しく、お願い致します。

#エラー文

NoMethodError in Words#index
Showing /Users/hayashiryouware/projects/words/app/views/words/index.html.haml where line #6 raised:

undefined method `to_key' for #<Word::ActiveRecord_Associations_CollectionProxy:0x00007ffd9c8d24e8>
Did you mean?  to_set
               to_ary
Extracted source (around line #6):
4      = link_to '単語登録', new_group_word_path, class:'btn-register'
5  .kensaku_word
6    = form_for @words, mehod: :get, url:group_words_path do |f|
7      = f.text_field :keyword, placeholder:'投稿を検索する', class:'serch_field'
8      = f.submit "検索", class:"search"
9  - @words.each do |word|

#ソースコード
#app> models> word.rb

class Word < ApplicationRecord
  belongs_to :user
  belongs_to :group

  mount_uploader :image, ImageUploader

  def self.search(search)
    return Word.all unless search
    Word.where('word LIKE(?)', "%#{search}%")
  end

end

#config> routes.rb

Rails.application.routes.draw do
  devise_for :users
  root to: 'homes#index'
  resources :groups, only: [:index, :new, :create, :edit, :update, :destroy] do
    resources :words, only: [:index, :new, :create, :edit, :update, :destroy] 
    collection do
      get 'search'
    end
  end
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

#app> controllers> words_controller.rb

class WordsController < ApplicationController
  #before_action :move_to_index, except: [:index, :search]

  def index
    @group = Group.find(params[:group_id])
    @words = @group.words
  end

  def new
    @words = Word.new
  end

  def create
    @words = Word.create(word_params)
    redirect_to group_words_path
  end

  def edit
    @word = Word.find(params[:id])
  end

  def update
    word = Word.find(params[:id])
    word.update(word_params)
    redirect_to group_words_path
  end

  def destroy
    word = Word.find(params[:id])
    word.destroy
    redirect_to group_words_path
  end

  def search
    @word = Word.new
    @words = Word.search(params[:keyword])
  end

  private
  def word_params
    params.require(:word).permit(:word, :meaning, :sentence, :image).merge(user_id: current_user.id, group_id: params[:group_id])
  end

end

#app> views> words> index.html.haml

.serach_word
  = form_with mehod: :get, url:group_words_path do |f|
        = f.text_field :keyword, placeholder:'投稿を検索する', class:'serch_field'
        = f.submit "検索", class:"search"
- @words.each do |word|
    .folk
      .center
        .textblock
          .word
            = word.word
          .meaning
            = word.meaning
        .image
          = image_tag word.image.url if word.image?
        .btnblock
          .edit_word
            = link_to '編集', edit_group_word_path(id:word.id), class:"edit_word_word"
          .delete_word
            = link_to '削除', group_word_path(id:word.id), method: :delete, class:"delete_word_word"
      .sentence
        = word.sentence
      .check
        =check_box_tag :check1
        =label_tag :check1, 'Who'
        =check_box_tag :check2
        =label_tag :check2, 'When'
        =check_box_tag :check3
        =label_tag :check3, 'Where'
        =check_box_tag :check4
        =label_tag :check4, 'What'
        =check_box_tag :check5
        =label_tag :check5, 'Why'
        =check_box_tag :check6
        =label_tag :check6, 'How'

#app> views> words> search.html.haml

.serach_word
  = form_with mehod: :get, url:group_words_path do |f|
        = f.text_field :keyword, placeholder:'投稿を検索する', class:'serch_field'
        = f.submit "検索", class:"search"
- @words.each do |word|
    .folk
      .center
        .textblock
          .word
            = word.word
          .meaning
            = word.meaning
        .image
          = image_tag word.image.url if word.image?
        .btnblock
          .edit_word
            = link_to '編集', edit_group_word_path(id:word.id), class:"edit_word_word"
          .delete_word
            = link_to '削除', group_word_path(id:word.id), method: :delete, class:"delete_word_word"
      .sentence
        = word.sentence
      .check
        =check_box_tag :check1
        =label_tag :check1, 'Who'
        =check_box_tag :check2
        =label_tag :check2, 'When'
        =check_box_tag :check3
        =label_tag :check3, 'Where'
        =check_box_tag :check4
        =label_tag :check4, 'What'
        =check_box_tag :check5
        =label_tag :check5, 'Why'
        =check_box_tag :check6
        =label_tag :check6, 'How'

#調べた内容・考え

form with を使用するとビューの表示は出来るのですが、検索ボタンをクリックしても検索されない為、form forで実装を試みた所、上記のエラーに当たってしまいました。
正直初めてみるエラーで検索してもしっくりくる記事がなく、質問しました。

hatsu

2020/03/02 04:37

Showing /Users/hayashiryouware/projects/words/app/views/words/index.html.haml where line #6 raised: の6行目と書かれていると思うのですが、6行目に該当する行も含めて載っていますか？ = link_to '単語登録', new_group_word_path, class:'btn-register' ようなコードが書いてあるらしいのですが、ご質問内容のコードには含まれていなそうで。。