A censored word should use exactly four asterisks.
This mixes letters with an asterisk mask. Confirm before replacing the entire censored-word candidate so no partial spelling remains.
Example
[Verse]
f*** this[Verse]
**** thisThe fix
In the workbench this finding carries one control, labelled Use four asterisks. The change is contextual, so it is previewed as a diff in your document first and applies only when you confirm it.
Source
The guideline this rule enforces, as cited on every finding it reports:
Censored words verified Use four asterisks for a censored word