Which process helps children to easily guess the meaning of nouns over verbs?

Fast mapping is the correct choice because it refers to the cognitive process by which children quickly learn and remember new words, typically during early language acquisition. This mechanism allows them to make connections between new vocabulary and context clues, facilitating a more effective understanding of nouns compared to verbs. Children often encounter nouns in more concrete situations and contexts, such as objects or people they see, which can be easier to identify and associate with meaning.

The other options highlight different aspects of language development but do not specifically address the guessing of meanings. Holophrase relates to a single word that conveys a complete thought, typically seen in early speech development. Overregularization refers to a grammatical error where children apply regular grammatical rules to irregular words (e.g., saying "goed" instead of "went"). Child-directed speech is characterized by a simplified or exaggerated form of speech that adults use when talking to children, designed to enhance understanding and engagement, but it doesn't directly aid in the rapid semantic mapping of nouns over verbs.