That's because Grace is not taught in the kingdom halls.
The word appears over 100 times in the new testament so it is pretty important
Strong's Greek Dictionary: 5485. charis (khar'-ece)
The reason the WT do not teach Grace is because it points to Jesus
John 1:17 (New International Version)
17 For the law was given through Moses; grace and truth came through Jesus Christ.
Every JW needs to know this verse
Romans 11:6 (New International Version)
6 And if by grace, then it is no longer by works; if it were, grace would no longer be grace.
And this
Galatians 5:4 (New International Version)
4 You who are trying to be justified by law have been alienated from Christ; you have fallen away from grace.
And these
Ephesians 2:8-9 (New International Version)
8 For it is by grace you have been saved, through faith—and this not from yourselves, it is the gift of God— 9 not by works, so that no one can boast.
This is worth bearing in mind too Jude 1:4
All the best,
Stephen