In VIGILANT some part of it sounds like WHISTLE..so think like this who WHISTLES in the night a GURKA or WATCHMAN who doesn't sleep in the night the are wakeful n cautious
v+igi+lan+t—V(we) at IGI airport have to KEENLY ALERT AND WATCHFUL TO DETECT DANGER at LAN(local area network) of airport to protect it from getting hacked by hackers
Vigilant and prudent have the same sounds and meaning - to be on your guard.
An elephANT is very vigilANT when it comes to mice
Word used in video below:
text: with a less than vigilant proprietor
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