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

Concise Bible Dictionary:

This word is often used in reference to ancient kingdoms, when the term simply signifies any memorial or inscription, embracing those found on bricks or tiles, equally with those found on tombs, or stately columns, or papyrus rolls.

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)