Choosing clear words
Clearly labeling your application avoids a host of user-related problems. Giving understandable names to options and buttons is harder than it looks, however, and if those are confusing, users will resort to tooltips and help text that also has to be written. At a basic level, you need to check that all the text is legible and displayed correctly, but the greater part of testing the words is to ensure they are as comprehensible as possible.
While technical writing is a topic I love (can you tell?), I don’t have space here to give an in-depth guide. As a tester, you won’t need to know every nuance, but there are certain checks that you can perform across many functions.
The first is simply consistency. If a group video call is referred to as a conference, then it should be a conference everywhere and not referred to as a meeting half the time. They may be synonyms as far as you’re concerned, but your application needs to pick one term...