9
below
8
down(adverb, seriously, actively, thoughtfully, purposefully)
8
under(adverb, seriously, actively, thoughtfully, purposefully)
8
floor(noun, level, story, bottom, administration)
7
downstair
6
beneath
6
downhill
5
abapical
4
down the stairs(expression, idiom, adverb)
4
downward
4
infra
3
bottom(seriously, actively, purposefully)
3
basement(noun, level, story, deck)
3
downwards
3
on a lower floor
3
underneath
2
below-decks
2
below par
2
below the mark(expression, idiom)
2
downgrade
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APASmart Define. (2015). downstairs thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/downstairs/thesaurus/synonyms
ChicagoSmart Define. 2015. "downstairs thesaurus" https://smartdefine.org/downstairs/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, downstairs thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/downstairs/thesaurus/synonyms>.
MLASmart Define. "downstairs thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/downstairs/thesaurus/synonyms>