RichThesaurus
number-one
number-one
synonyms
chief
principal
foremost
main
central
prime
key
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leading
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paramount
supreme
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uppermost
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arch-
greatest
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staple
head
best
master
(most) prominent
of prime importance
star
more synonyms
number-one
antonyms
minor
subordinate
subsidiary
secondary
worst
pseudo-
secondary
peripheral
unimportant
inessential
irrelevant
minor
last
insignificant