What is the word for learning forms of a word?

There isn't one single perfect word for "learning forms of a word", but here are some options depending on the specific context:

General:

* Morphology: This is the study of word formation, including prefixes, suffixes, and other word parts.

* Inflection: This specifically refers to changes in a word's form to indicate grammatical function, such as tense, number, or case.

* Word building: This is a broader term for learning how words are constructed and modified.

More specific:

* Conjugation: This refers to learning the different forms of verbs.

* Declension: This refers to learning the different forms of nouns and adjectives.

* Paradigm: This refers to a set of all the forms of a word, often presented in a chart.

Informal:

* Learning the declensions/conjugations: This is a simple and direct way to refer to the process.

* Mastering the different forms: This emphasizes achieving a high level of proficiency.

The best word will depend on the specific context and what you want to emphasize.