Why does the word "Master" show up in search results?

Merged help?

That's a first. No one has ever reported that issue.

First of all try the About RoboHelp sample project. In the new UI you should see them on the Starter Screen but if not click Open Project and browse to Documents and then My RoboHelp Projects. That should confirm the issue is your project rather than something in RoboHelp itself.. The issue is then what and on this one I am struggling to think what you could have done.

1. Do you have a Topic Layout linked to your topics? They used to be called Master Pages so perhaps there is something in that.
2. Set up Find and Replace with these settings.
   
3.  If that does not help, can you share the project? If you can, then see the Contact page on my site and send the project as instructed there. Do make sure you include a link to this thread and please do not email the project direct.
4. If you cannot share, and my suggestions do not help, you will have to try Adobe Support. They will need to see the project though. See https://helpx.adobe.com/contact/enterprise-support.other.html#robohelp for your Adobe Support options. The email link tcssup@adobe.com is recommended as it reaches a team dedicated to Technical Communication Suite products including RoboHelp.

Do let us know what you find. 

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.