Greasy Fork is available in English.
The more questions you answer the smarter it will get. Features: spelling-assistance & auto - complete, definitions and examples, actively learning bot.
< Vocabulary.com Answer Botについてのフィードバック
Thats because that question and answer hasnt been saved in the database. This script is user sourced so the more people that use it, the more question and answers are saved which in turns helps everyone out.
It some time never shows the answer and its not auto