THESAURI. AUSTRALIAN. The Macquarie Primary Thesaurus introduces the upper primary school student to over 940 word groups. Each word group consists of words and phrases with closely related meanings to avoid confusion. Within each word group the meanings of the words are explained and used in context. This thesaurus is based on the Macquarie Primary Dictionary's list of words. It has a clear, open design to help the consolidating learner quickly find appropriate words. Ages 9+.