Espionage would be one word.
espionage
The practice of spying or using spies is known as espionage. It involves gathering secret and confidential information about individuals, organizations, or governments, typically for political, military, or economic reasons. Espionage is often used by intelligence agencies to gain a strategic advantage or protect national security interests.
artist is the prefix of art
She said he was stalking her because he was spying on her house and followed her everywhere she went.
Chapter 13 of the Art of War is all about spies. Sun Tzu thought that using spies to gain information, either your own or by getting enemy spies to give up information was an important part of a war effort.
To forbid the practice of making, selling, or using something means to officially ban or prohibit those activities. It indicates that the activity is not allowed by law or regulation.
Chalkin' refers to the practice of using chalk paint on furniture. This can be done as a means of refinishing furniture.
To forbid something means to prohibit, ban, or disallow the practice of making, selling, or using that particular thing. It implies a restriction or a legal prohibition against engaging in the specified activity.
Some of the President's advisors, all Republicans, were caught spying on the planning meetings of the Democrats in the Watergate Hotel, using a 'bug' and recording device. This practice was considered to be very unethical.
Child soldiering
The word is "sesquipedalian," which refers to the practice of using long, complex words in speech or writing.
Serendipity - the occurrence of finding good things without looking for them. Example sentence: "Their chance encounter was a stroke of serendipity that eventually led to a lifelong friendship." Aberration - a departure from what is normal, usual, or expected. Example sentence: "The sudden outburst was considered an aberration in her otherwise calm demeanor." Espionage - the practice of spying or using spies to obtain information. Example sentence: "The espionage operation revealed sensitive government secrets." Mellifluous - sweet or musical; pleasant to hear. Example sentence: "A mellifluous voice filled the concert hall, captivating the audience."