There is NO alternative that is as mature on the Linux platform or as intuitive if you have previously used MS Office.
HOWEVER, you have a few options that are better aligned with the future; The Cloud. You may create a Microsoft account at live.com etc. and freely use the online office version without any platform dependency. It may have some limitations but is perfectly compatible with the other MS office versions.
ALSO, you may want to try the google alternatives as it is superior in many ways to anything else; you can easily use the voice dictation built in for several languages, as well as translation and lookup options. You also have superior collaboration options, since you can have several people working in the same document at the same time... and it actually works well. Please NOTE that google suite can also edit native Office docs to some extent directly.
Libre Office tries and tries but still remains a bit cludgy and rather 90's in my experience. This makes me feel disappointed since it is a good truly open piece of software.
./hope that helps..