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Administration > Tools > Batch update > Search and replace.

Settings:
Search method: Whole words only
Case insensitive: tick (unless you are confident in case in question.
Search text/pattern: engag
Replacement text: This will vary depending on the result. Case-sensitivity can not be applied to the replacement, so if you find Engag you will need to replace with Engagement; find engag, replace with engagement. Alternatively, don’t tick Case insensitive and search first for Engag with the upper case replacement; then again for engag with the lower case replacement.

Nigel
My personal kiwitrees site is www.our-families.info