Brain
Brain noun - A very smart person.
Intelligent and brain are semantically related. In some cases you can use "Intelligent" instead a noun "Brain".
Intelligent
Intelligent adjective - Having or showing quickness of mind.
Brain and intelligent are semantically related. Sometimes you can use "Brain" instead a noun "Intelligent".
Mutual synonyms
Both words in one sentence
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In his book The Dragons Of Eden, Carl Sagan notes that the species with large brain-mass to body-mass ratios tend to be those that most biologists think of as the most intelligent.
Source: My Brain Is Big - Lickers have a large, exposed brain but while they're more intelligent than the zombies they were made from (to the point where they can follow orders), this isn't saying much.
Source: My Brain Is Big - In the Animorphs series, there is one book in which a species of intelligent birds on the Hork-Bajir homeworld have the technology to create computer-backups of a person's mind, which can be inserted into someone else's brain after the original's death, to temporarily share their body.
Source: Brain Uploading
Cite this Source
Intelligent and Brain. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/brain/intelligent
Brain & Intelligent. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/brain/intelligent>.
Intelligent or Brain. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/brain/intelligent.
Google Ngram Viewer shows how "brain" and "intelligent" have occurred on timeline