Which item heading for the result when searching a corpora for phrases?

Please advise:

I have searched 'Early English Books Online' (it might as well have been another 'corpora engine') to look for the 'frequency' of idiomatic phrases.
I need to report these findings very carefully.
which heading do I choose? I know that there are 'dictionary entries' and 'Encyclopaedic entries', but they are 'fixed'- they do not alter; they are 'static'.
Any suggestions
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