In the following question, select the synonym (word most similar in meaning) of "sentry".

Introduction / Context:
This vocabulary question asks for a synonym of the word "sentry". Such words are often used in descriptions of armies, security, and guarding. Recognising them helps in understanding passages on war, history, or security matters.

Given Data / Assumptions:

• Target word: "sentry".
• Options: "bandit", "competitor", "sentinel", "foe", "warrior".
• We must choose the word closest in meaning to a guard or watchman.

Concept / Approach:
"Sentry" means a soldier or guard whose job is to stand and keep watch, especially at the entrance to a place or at some strategic point. The word "sentinel" has almost the same meaning: a guard or lookout who stands watch. Other options like "bandit", "competitor", "foe", and "warrior" may be related to conflict but do not specifically refer to someone whose duty is to keep watch.

Step-by-Step Solution:
Step 1: Define "sentry" as a guard or soldier posted to keep watch at a certain spot.Step 2: Compare each option: "bandit" (robber), "competitor" (rival), "sentinel" (guard), "foe" (enemy), "warrior" (fighter).Step 3: Notice that "sentinel" matches "sentry" exactly in the sense of someone who stands watch.Step 4: Confirm that the other words either describe criminals, enemies, or fighters, not specifically watchmen.Step 5: Select "sentinel" as the correct synonym.

Verification / Alternative check:
Use both words in similar sentences: "The sentry stood at the gate all night" and "The sentinel stood at the gate all night." Both sentences are correct and convey the same idea of a guard on duty. If we substitute "bandit", the sentence would mean a robber stood at the gate, which is clearly different.

Why Other Options Are Wrong:

• bandit: A robber or outlaw who attacks and steals; an enemy of security, not a guard.
• competitor: Someone who competes, especially in business or sports; no relation to guarding.
• foe: An enemy, opponent, or adversary; again, not a guard.
• warrior: A fighter, especially in battles; while warriors may fight, they are not by definition guards posted on watch.

Common Pitfalls:
Some examinees might select "warrior" or "foe" just because these words are associated with battles and soldiers. However, synonym questions require you to be precise: "sentry" refers to a particular role (standing guard), not just any person involved in war. Always match the core meaning, not just superficial associations.

Final Answer:
The synonym of "sentry" is sentinel.