1. Word classes: This is a broad term that encompasses grouping words based on their grammatical function (e.g., nouns, verbs, adjectives, adverbs).
2. Parts of speech: This is a more specific term that refers to the traditional categorization of words based on their grammatical function.
3. Lexical categories: This term is often used in linguistics to refer to groups of words with similar syntactic and semantic properties (e.g., verbs, prepositions, pronouns).
4. Semantic fields: This refers to groups of words that share a common conceptual domain or meaning (e.g., words related to color, transportation, or emotions).
5. Morphological classes: This refers to groups of words that share similar morphological properties (e.g., words with the same suffix, words with the same root).
6. Word families: This term can be used to describe a group of words that are related to each other through etymology or meaning (e.g., "happy," "happiness," "happily").
The specific term you use will depend on the specific kind of grouping you are referring to.
For example, if you are talking about grouping words based on their grammatical function, you would likely use "word classes" or "parts of speech." If you are talking about grouping words based on their meaning, you might use "semantic fields."