In the following word analogy, Pacific is related to Ocean in a particular way. Using the same pattern, which word should complete the analogy Pacific : Ocean :: Nile : ?

Introduction / Context:
This is a verbal analogy that checks your knowledge of world geography and your ability to recognise category relationships. The word Pacific refers to the Pacific Ocean, which is a specific example of the general category Ocean. In the same way, the word Nile refers to a specific geographical feature, and we must identify the correct category for it from the options given.

Given Data / Assumptions:
We are given the pair Pacific : Ocean. We must complete the pair Nile : ?. All words are geographical terms used in their standard meanings. The relationship in both pairs should be of the same type, ideally name to category.

Concept / Approach:
In the first pair, Pacific is the proper name of a specific water body, and Ocean is the general category to which the Pacific belongs. Therefore, the relationship is particular to general or example to class. To maintain a consistent analogy, we must treat Nile as another specific example and select the word that expresses its general category. Knowing that the Nile is among the world's longest rivers is the key to answering this correctly.

Step-by-Step Solution:
Step 1: Analyse the first pair. The Pacific is one of the five major oceans on Earth. Therefore, it belongs to the category Ocean. Step 2: Identify the pattern. The pattern is specific geographical name to general type of geographical feature. Step 3: Apply the pattern to Nile. The Nile is a long natural stream of water that flows across parts of Africa and empties into the Mediterranean Sea. The general category for such a water body is River. Step 4: Match with the options. Among Waterfall, River, Mountain, Lake, and Sea, the only correct general category for the Nile is River.

Verification / Alternative check:
We can restate both pairs as descriptive sentences. The Pacific is an ocean. The Nile is a river. Both sentences have the same structure: a specific proper noun followed by its category noun. Other combinations like The Nile is a waterfall or The Nile is a lake are factually wrong. The pattern of particular to general is therefore preserved only when we select River as the missing word.

Why Other Options Are Wrong:
Waterfall refers to water dropping over a vertical edge, which does not describe the Nile as a whole. Mountain is a raised landform and has no direct relation to the Nile as a river. Lake describes a large body of water surrounded by land, not a flowing watercourse. Sea is a large salt water body connected to an ocean, again not a river.

Common Pitfalls:
Some learners might focus only on words associated with water and overlook the precise type of feature represented by the Nile. It is also easy to confuse seas, oceans, and rivers if you do not recall basic geography. The safest approach is to first state clearly what the given proper noun represents in the real world and then select the category that exactly matches that description. This habit leads to accurate reasoning in many world knowledge analogies.

Final Answer:
The word that correctly completes the analogy is River.