Test pilot blows top with a number of counts (6)

I believe the answer is:

titles

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'counts' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their -s form.
Maybe you can see an association between them that I can't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for titles that I've seen before include "Handles" , "Formal names or grades" , "Designations of honour or office" , "Appellations signifying status or function" , "Lord, Lady etc." .)

I've seen this clue in the Irish Times.

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