Synonyms|44Antonyms|3|Broader|3Narrower|0Related|97
9
eldest(adjective, age, oldness)
3
elder(adjective, age, oldness)
3
firstling
2
first-born(noun, adjective, senior, older, elder)
1
ancient
1
antique
1
entailed
1
first
1
older(adjective, age)
0
autochthon
0
boy
0
child
0
daughter
0
event
0
extend
0
extraction
0
first child(expression, idiom)
0
first principle(expression, idiom)
0
frogspawn
0
fruitage
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APASmart Define. (2015). firstborn thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/firstborn/thesaurus/synonyms
ChicagoSmart Define. 2015. "firstborn thesaurus" https://smartdefine.org/firstborn/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, firstborn thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/firstborn/thesaurus/synonyms>.
MLASmart Define. "firstborn thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/firstborn/thesaurus/synonyms>