If you want better compatibility with Microsoft Office files, you could use WPS Office. It has given me better results overall than OnlyOffice and far better than LibreOffice.
Not dissing the other suites, I like LibreOffice for daily use but there’s nothing I can do about M$ Office templates bugging out because they don’t follow their own OOXML implementation properly.
I think you’re right when saying “day-mun” for daemon as my language, Basque, uses the term “daimon” when referring to service daemons in software engineering, which is taken from the pronunciation in English.