See http://wordfaqs.ssbarnhill.com/MasterSpellCheck.htm which covers all you need to know about spell checking.

If you want Word to remember your spellings add them to the personal dictionary.

Blue underlines are for potential context sensitive spelling errors. Grammar errors are marked with green underlines.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com