There is at least one study, "Emily Dickinson's Poetic Vocabulary," which discusses her favorite words and the words she used most frequently (not the same thing). Access to the online study requires 25 USD or membership in a group or library associated with Cambridge University Press, which may include you. Here's a link:
https://www.cambridge.org/core/journ...1A7344CF5F6E69
The BYU Lexicon is free, and it has been invaluable to me. Here's a link to a John Clare Concordance, which doesn't answer your immediate question but, like the Lexicon, is fun for browsing.
http://victorian-studies.net/concordance/clare/