I use xxxxxx as markers in my document for spots I need to look up the word or name for in a later pass , or remind myself to edit a certain section again . However , my LO spellchecker also won ' t catch purposely misspelled words like dgo or cta dog or cat , either . I ' ve had sporadic problems with LO for years , but usually could get it working again if I kept fiddling with it . During the last few LO upgrades though , that changed markedly for the worse . I use the native odt files , only exporting to MS doc for the versions I want to upload to Amazon Kindle publishing . I never use LO to edit a file that ' s been converted to doc format . My spell problem seemed to get worse after I wrote a couple of large books in LO . On Amazon one of them rates as just under 600 pages . I also do a lot of incremental saves for back up reasons , like file 1 , file 2 , file 3 , etc . , plus LO does its own automatic saves as I work . I HAVE added dozens of words to LO ' s dictionary but you pretty much have to , as a practical manner , as it can wrongly flag lots of words which are routinely found in multiple online dictionaries via Google . Often LO flags legitimate words simply because they have a perfectly fine prefix or suffix attached to them . I ' m hesitant about uploading a sample file , because they ' re all my unprotected book files , either published , or works in progress , and very important to me .