Eldest
Eldest adjective - First in order of birth.
Firstborn
Firstborn adjective - First in order of birth.
Usage example: the firstborn child
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Synonyms for Firstborn
Eldest is a synonym for firstborn in most senior topic. You can use "Eldest" instead the word "Firstborn" as an adjective or a noun.
Both words in one sentence
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What, the locusts and the death of the firstborn wasn't good enough for you anymore so now it's the death of the eldest?
Source: Series / Jeremiah - Occasionally referred to as 'the firstborn son', 'the eldest brother', and 'the inheritor son' in more detailed theological discussions.
Source: Useful Notes / Mormonism - The firstborn daughter of any family is named Eldest and raised to be the leader of her siblings.
Source: Last Name Basis / Literature
Cite this Source
Firstborn and Eldest. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/eldest/firstborn
Eldest & Firstborn. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/eldest/firstborn>.
Firstborn or Eldest. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/eldest/firstborn.
Google Ngram Viewer shows how "eldest" and "firstborn" have occurred on timeline