Add model specs

spec/models/word_spec.rb

@@ -0,0 +1,8 @@
+require 'rails_helper'
+
+RSpec.describe Word, type: :model do
+  it "successfully creates a new word" do
+    word = FactoryBot.create(:word)
+    expect(Word.count).to eq(1)
+  end
+end