Choose the word that is least like the other words in the group from the following: Canoe, Dingy, Yatch and Igloo. Three of these are small watercraft used for travelling on water, while one is a type of shelter built on land.

Introduction / Context:
This is a straightforward classification question involving common nouns. You are given four words: Canoe, Dingy, Yatch and Igloo. Three of these words name watercraft or boats used for travelling on lakes, rivers or seas, while one names a type of house or shelter made of compacted snow. You must identify the word that does not belong to the group of water vehicles and mark it as the odd one out.

Given Data / Assumptions:

• Canoe: a small, narrow boat typically paddled with a paddle.
• Dingy (dinghy): a small boat, often used as a tender or for short trips.
• Yatch (yacht): a relatively large and often luxurious boat used for pleasure cruising or racing.
• Igloo: a dome shaped shelter built from blocks of snow, traditionally used in Arctic regions.
• We group words according to whether they refer to watercraft or to stationary shelters on land.

Concept / Approach:
The concept tested is categorisation by function and environment. Canoe, dinghy and yacht are all vehicles that float on water and are designed for transport or recreation on seas, rivers or lakes. Igloo, by contrast, is a shelter built on land, specifically in polar regions, and has nothing to do with water transport. The odd word will be the one whose primary function and environment are completely different from the others in the list.

Step-by-Step Solution:
Step 1: Examine Canoe.A Canoe is a light, narrow boat used on rivers and lakes, powered by paddles. It is clearly a water vehicle.Step 2: Examine Dingy.A Dingy (more commonly spelled dinghy) is a small boat used as a tender or for short trips near shore. It is also a watercraft.Step 3: Examine Yatch.Yatch (yacht) refers to a larger pleasure boat or sailing vessel, again designed to travel on water.Step 4: Examine Igloo.An Igloo is a type of winter shelter made from blocks of snow, traditionally associated with Inuit and Arctic cultures. It is not a vehicle and is not used for water transport.Step 5: Identify the odd word.Three words are names of boats and one is a type of house. Therefore Igloo is the odd one out.

Verification / Alternative check:
Another way to verify is to ask a simple question: can this item float and carry people across water? A Canoe can, a Dingy can and a Yatch can, because all are boatlike structures. An Igloo, however, is fixed on land, usually on snow or ice, and serves as a dwelling. It cannot function as a water vehicle. This clear difference in both purpose and environment confirms the choice without any ambiguity.

Why Other Options Are Wrong:
Canoe: A type of boat, so it clearly belongs with Dingy and Yatch.
Dingy: Another small boat, used on water and part of the same category.
Yatch: A pleasure craft or yacht, again a boat and not the odd one.

Common Pitfalls:
The only possible confusion might come from unfamiliar spellings such as Dingy for dinghy or Yatch for yacht. However, even with spelling variations, context makes it clear that they refer to watercraft. When solving classification questions, focus on the core meaning of each word rather than the exact spelling, especially if the spelling appears to be a minor variation or typographical error.

Final Answer:
The odd word is Igloo, because Canoe, Dingy and Yatch are all types of boats used for travelling on water, whereas Igloo is a snow house or shelter built on land.