8
least(adjective, order, size, slightest, smallest)
8
major(adjective, top, superior, unusual, important)
8
pristine(adjective, order, simple, clean, pure)
8
rudimentary(adjective, order, important, basic, vital)
7
top(noun, adjective, good, quality, great)
7
famous(adjective, great, fine, superior, important)
7
former(adjective, order, time, original, past)
7
pioneer(adjective, pronoun, order, start, original)
7
ranking(adjective, importance)
7
rather(adverb, sooner, instead, preferably)
7
senior(adjective, rank, post, status, age)
7
smallest(adjective, order, size)
7
sovereign(adjective, excellent, superior, importance, outstanding)
6
key(adjective, order, important, prominent, basic)
6
slightest(adjective, order, size)
6
advanced(adjective, lead, importance, original, sophisticated)
6
antecedent(adjective, order, original, old, primary)
6
anterior(adjective, order, old, origin, departed)
6
at first(expression, idiom, adverb)
6
first of all(expression, idiom, adverb)
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APASmart Define. (2016). first thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/first/thesaurus/synonyms
ChicagoSmart Define. 2016. "first thesaurus" https://smartdefine.org/first/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, first thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/first/thesaurus/synonyms>.
MLASmart Define. "first thesaurus" 31 March 2016. Web. 20 September 2026. <https://smartdefine.org/first/thesaurus/synonyms>