Basic idea
Substance and basic idea are semantically related. in essence topic. In some cases you can use "Substance" instead a noun phrase "Basic idea", when it comes to topics like theme.
Substance
Substance noun - The basic elements from which something can be developed.
Basic idea and substance are semantically related. You can use "Basic idea" instead a noun "Substance".
Cite this Source
Substance and Basic idea. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/basic_idea/substance
Basic idea & Substance. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/basic_idea/substance>.
Substance or Basic idea. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/basic_idea/substance.
Google Ngram Viewer shows how "basic idea" and "substance" have occurred on timeline