The Key Contents from this Module are:

A Word is a minimal unit of meaningful speech that can stand on its own. Its basic concepts are:

It is a mental representation of statistical regularity in our experience.
It is a representation of classes of objects or events.
It provides expectations and guides our response to new instances of those objects or events

The Dual Nature of words are:

Its Phonological form; which represents how it sounds
Its Semantic representation; which represents its meaning.

The two main categories of words are:

Content Words: These are words that are defined by the concepts they represent or the role they play in sentences. They include nouns, pronouns, verbs, adjectives, etc.
Function Words: These are words that are included in sentences to serve grammatical purposes. They include prepositions, determines and conjunctions.

The main reason for rapid vocabulary growth include:

Naming insight
Mastery of phonology
Improved memory
Increased social engagement

The three steps of learning a word are:
Constructing a concept
Learning a phonological word form
Associating concepts with the word form

Receptive vocabulary is a set of words a person recognizes and understands their meaning.

Productive vocabulary is a set of words a person produces in their appropriate contexts.

Fast mapping is the ability to learn new words after only a few exposures to such a word.

The Mental Lexicon is a 'mental dictionary' that contains information regarding a word's meaning, pronunciation or syntactic characteristics.