True
True adjective - Having or showing the qualities associated with the members of a particular group or kind.
Usage example: paleontologists are still debating whether the fossil is that of a true dinosaur or a precursor
Textbook
Textbook adjective - Constituting, serving as, or worthy of being a pattern to be imitated.
Cite this Source
Textbook and True. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/true/textbook
True & Textbook. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/true/textbook>.
Textbook or True. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/true/textbook.
Google Ngram Viewer shows how "true" and "textbook" have occurred on timeline