Replacement method in Sublime Text 3.2.1 via "Find in files...":

Find: (?<!\S)plugin(s?)(?!_|\.|,[a-z])

Where: <project root>\drupal\modules\ambientimpact,-*assets/vendor*,-node_modules/*,-*.json,-migrate_plus.*.yml

Replace: plug-in$1

Using regular expression and case sensitive.

Note: manually replaced in migrate_plus.*.yml files.