Resources mentioned:

Core Vocabulary Words: https://textproject.org/vocabulary-instruction/core-vocabulary

Academic Word List: https://www.wgtn.ac.nz/lals/resources/academicwordlist/information/thesublists

Mini Matrix Maker: https://www.neilramsden.co.uk/spelling/matrix/

Academic Word Finder: https://achievethecore.org/page/1027/academic-word-finder

One Look Dictionary and Thesaurus: https://www.onelook.com/

Online Etymology Dictionary: https://www.etymonline.com/

Coh-Metrix Common Core Text Ease and Readability Assessor: https://soletlab.adaptiveliteracy.com:8443/

BONUS RESOURCE:
The Collins Cobuild dictionary provides student friendly definitions, and game-like challenges.

https://www.collinsdictionary.com/us/dictionary/english

Produced by Noble Academy, a school for students with learning differences in Greensboro, NC. https://www.nobleknights.org/