Here's why:
* Base words are the simplest form of a word, from which other words are derived. They are not themselves derived from other words.
* Some words are base words themselves. These are the fundamental building blocks of language. Examples include:
* "run"
* "happy"
* "tree"
* "love"
* Other words are derived from base words. These are called derived words or inflected words. They are formed by adding prefixes, suffixes, or changing the base word's internal form (e.g., changing "run" to "running").
Therefore, only derived words have base words. Base words themselves do not have base words.