Merriam-Webster Dictionary: https://www.merriam-webster.com/
Freerice Vocabulary Practice : www.freerice.com
Vocabulary Lesson Assignments: www.vocabulary.com
Online Dictionary: https://www.dictionary.com/
Online Dictionary: www.wordnik.com
Books Online: https://www.bookshare.org/home
Oxford Learners Dictionary https://www.oxfordlearnersdictionaries.com/us/