This question asks you to identify the correct word for "one who collects postage stamps". This is a test of your vocabulary and knowledge of specific terms.

The correct word is Philatelist.

Let's break down why:

Philatelist is a noun that specifically refers to a person who collects or studies postage stamps. The field itself is called philately.

Now, let's see why the other options are incorrect:

• Vendor: A vendor is a person or company that sells something. A stamp vendor sells stamps, but they do not necessarily collect them as a hobby.
• Lexicographer: A lexicographer is a person who compiles dictionaries. This is unrelated to stamps.
• Stamp seller: This is a descriptive phrase for someone who sells stamps, not the specific term for a collector.

Related Topics & Theory

Vocabulary (Word Meanings): Building a strong vocabulary involves learning the precise meanings of words, including more specialized terms like "philatelist". It helps in accurate communication and comprehension.

Noun (Types of Nouns): "Philatelist" is an example of a specific type of noun. It is a common noun (as it refers to any person with this hobby, not a specific one) and can also be considered a agent noun (a noun that denotes a person who performs the action of a verb, in this case, the verb would be "to collect stamps").

Key Formulae/Concepts

While there is no mathematical formula for this, the key concept is:

Word = Definition

In this case: Philatelist = One who collects or studies stamps