oh i got it! the"词” means that词 is emphasized or have some special meaning.such as 我"喜欢"你，maybe the 喜欢 is not present 喜欢or even present not like

it's " ‘词 " ，a mark will go after what you have typed when you use this button, shows that you are gonna tpye another new word. And this word won't affect the former one. eg: 平安 ping'an , not 聘干pin’gan

Maybe your question is not clarily