Here's how it breaks down:
* Word root: This is the base form of a word, carrying its core meaning. For example, "act" is the root of "action," "active," and "actor."
* Special vowel call: This likely refers to a vowel used to connect the root to an affix, which is a word part added to a root to modify its meaning or grammatical function. These vowels are often called connecting vowels or linking vowels.
Examples:
* Prefixes: "un- + happy = unhappy" (the "u" is the connecting vowel)
* Suffixes: "act + -ion = action" (the "i" is the connecting vowel)
Therefore, "word root plus a special vowel call" can be interpreted as describing the process of adding prefixes or suffixes to a word root, using a connecting vowel to create new words with modified meanings or grammatical roles.