besieged, hidden thing, keep(-er, -ing), monument, observe, preserve(-r), subtil, watcher(-man)

Strong’s Dictionary of Hebrew Words:

Transliteration:
natsar
Phonic:
naw-tsar’
Meaning:
a primitive root; to guard, in a good sense (to protect, maintain, obey, etc.) or a bad one (to conceal, etc.)
KJV Usage:
besieged, hidden thing, keep(-er, -ing), monument, observe, preserve(-r), subtil, watcher(-man)