Here's a breakdown:

* Morphology: This branch of linguistics focuses on the internal structure of words and how they are formed.

* Forms of words: This refers to the different parts of a word, like prefixes, suffixes, roots, and how these parts combine to create meaning.

For example, morphology would analyze how the word "unbreakable" is formed from the prefix "un-", the root "break", and the suffix "-able".

Essentially, morphology helps us understand how words are built, and how changes in their structure affect their meaning.