Synonyms for Undersurface:

• n.

  •
  • underneath,
  • over.
  •bottom (noun)
  • bedrock,
  • base,
  • footing,
  • lowest part,
  • pedestal,
  • pediment,
  • floor,
  • substratum,
  • nadir,
  • ground,
  • basement,
  • depths,
  • underside,
  • basis,
  • sole,
  • underbelly,
  • bed,
  • nether portion,
  • substructure,
  • belly,
  • deepest part,
  • foot,
  • rest,
  • seat,
  • terra firma,
  • support,
  • groundwork.
  •underside (noun)
  • under surface,
  • under surfaces,
  • under-surfaces,
  • under-neath,
  • under sides,
  • under-surface,
  • underneaths,
  • under-side,
  • under side,
  • under-sides,
  • under neath.
  •undersurface (noun)
  • bottom.

• Other synonyms:

  •Other relevant words:
  • rear end.

Antonyms for Undersurface:

• n.

  • bottom
    annex, ceiling, top.
  • Other antonyms:
    crest, head, summit, tip-top, peak, high-water mark, culmination, crown, pinnacle, roof, cusp, point, climax, face, zenith, height, apex, tip, acme, meridian.