Q:

What is the difference between the tags [word-choice] and [word-difference]?

Should they be marked as synonyms?

A:

word-difference: you ask for the difference between words
word-choice: you ask which word you should use in a specific context
The emphasis can be very different. With "word-choice" you can ask opinion about if the word is uzinda or is useable in a specific context. "word-difference" is much more about the meaning, and not the usability and uzindability.

