This is very much a draft of a concept I had in mind to do to help learners learn to most common words first but it has many uses of course and could be used for serious research if taken further.
It currently uses the DCS database as it's corpus but this could be extended if there were other word level databases.
Enjoy and would appreciate your feedback. Particularly about the date ranges if they make sense to you:
Just click on them above to see the selected ranges.
Kindest Wishes,
Martin