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What is the difference between נצר natzar (keep, gaurd, watch, preserve) and שמר shamar?
Their meaning looks so similar that I would like to know what makes the difference between these two.
(For example in the verse of Tehillim 105:45, Mishlei 2:8, 2:11, 4:6 etc.)
Malbim (ביאור המילות) writes on your first cited verse (Tehillim 105:45):
ישמרו, ינצרו. הנוצר גדול מן השומר, והתורות צריכים שמירה יתירה יותר כי הם כוללות גם עקרי האמונה והלמודים
"נצר" is a greater degree of "guarding" than "שמר;" because the תורות need to be guarded more because they also contain the main tenets of our faith and learning.
(my translation)
@pung. I just wanted to point out that if people thought that this was a low-quality question, that there is a similar (very highly voted) question that was asked a while ago, and deemed on-topic.