Online dictionaries https://www.yourdictionary.com/
https://www.alphadictionary.com/index.shtml
https://dictionary.cambridge.org/
Prefixes, suffixes, roots https://www.wordfocus.com/vocabulary-resources.html
https://www.virtualsalt.com/roots.htm
Academic word list https://www.edict.com.hk/textanalyser/wordlists.htm
https://www.edict.com.hk/lexiconindex/awl/
Games https://www.orst.edu/Dept/eli/july2000.html
Advanced https://www.english-zone.com/vocab/index.php?CID=3
General https://www.english-zone.com/vocab/index.php
Links https://www.vocabulary.com/
Teaching https://coe.sdsu.edu/people/jmora/ConceptsTch.htm
https://www3.bc.sympatico.ca/linguist…ocabulary.html
Tests https://a4esl.org/q/h/vocabulary.html
https://www.iei.uiuc.edu/student_inte…s.html#reading
Software https://www.er.uqam.ca/nobel/r21270/textools/web_vp.html
Concordance https://vlc.polyu.edu.hk/concordance/
TOEFL
(If you type TOEFL vocabulary in a search box, you will find thousands of other sites) https://www.toeflvocabulary.com/