Hi, I would like to make a request!
Overall, all the dictionaries are good, but if you can implement more thesauruses and more websites it would be absolutely amazing. I know that we have Merriam-Webster, but I believe there are more options to choose from. :$
Here is the list:
https://www.thesaurus.com/ - Amazing website where you can even compare words to get an accurate word choice
https://www.powerthesaurus.org/ -Can generate an image of the top 5 words related to the word you searched. very cool feature
https://english.dict.naver.com/english-dictionary/#/main - Naver in ENG - ENG. I use the Korean version that you made, but I would appreciate if you could add the ENG - ENG version because it include basicaly everything and is usefull too. Actually one of my favorites, I love it 
Last but not least, I'm wondering if you could add Word-Reference synonyms ENG - ENG monolingual ver
https://synonyms.reverso.net/synonym/en/ - sort of a thesaurus, but is more complete. Reverso synonyms can search synonyms, antomyms, and examples, reverso can even separate queries depending on the role of the word in part of speech.
I hope all these websites get implemented soon!
Keep it rolling, peace out! 