DICTIONARIES

http://flax.nzdl.org/greenstone3/flax

http://wordvis.com/

http://ww12.americancorpus.org/

http://www.cooldictionary.com/ — PRONUNCIATION

http://www.freecollocation.com/ — COLLOCATIONS

http://www.just-the-word.com/

http://www.natcorp.ox.ac.uk/

http://www.ozdic.com/

http://www.snappywords.com/?lookup=learning

http://www.visualdictionaryonline.com/

http://www.wordreference.com/

https://context.reverso.net/traduccion/espanol-ingles/campa%C3%B1a — BILIN

https://en.oxforddictionaries.com/english-thesaurus

https://graphwords.com/word#education

https://howjsay.com/ — PRONUNCIATION

https://infovisual.info/es — PICTORIAL

https://prowritingaid.com/Free-Online-Collocations-Dictionary.aspx

https://sites.google.com/site/gloriasspot/did-you-know-that — DID YOU KNOW THAT...?

https://thesaurus.yourdictionary.com/

https://visuwords.com/

https://westegg.com/etymology/

https://www.britannica.com/ — ENCYCLOPAEDIC

https://www.collinsdictionary.com/dictionary/english-thesaurus

https://www.enchantedlearning.com/Dictionary.html

https://www.etymonline.com/ — ETYMOLOGY

https://www.linguee.com/ — USAGE

https://www.merriam-webster.com/

https://www.merriam-webster.com/thesaurus

https://www.oxfordlearnersdictionaries.com

https://www.oxfordlearnersdictionaries.com/definition/collocations/

https://www.thefreedictionary.com/

https://www.thesaurus.com/

https://www.visualthesaurus.com/