Synonyms for Basement:

n.

crypt, excavation, downstairs, loft, gallery, the first floor, bunker, lower ground floor, ground floor, floor, level, vault. artifact (noun)
cellar.
basement (noun)
cellar.
bottom (noun)
foot, bottom, underside, underneath, foundation, nadir, sole, depths, base.
foundation (noun)
footing, wall.
room on lower floor of building (noun)
cellar, crypt, bottom, excavation, vault.

Other synonyms:

ground floor, downstairs, the first floor, lower ground floor. floor. gallery. loft. level.

Usage examples for basement

  1. It was just as if you were to say she lived in the basement back at Number 27. A hard life!... – The Garden Party by Katherine Mansfield
  2. They watched her disappear on her way to find the basement and the formidable Sarah Gailey. – Hilda Lessways by Arnold Bennett
  3. Today I locked him in the basement and he begged so to come along! – The Merriweather Girls and the Mystery of the Queen's Fan by Lizette M. Edholm