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Substraction vs Substruction - What's the difference?

substraction | substruction |

As nouns the difference between substraction and substruction

is that substraction is (obsolete) subtraction; deduction while substruction is (architecture) underbuilding; the foundation, or any preliminary structure intended to raise the lower floor or basement of a building above the natural level of the ground.

substraction

English

Noun

(en noun)
  • (obsolete) subtraction; deduction
    • (Webster 1913)

    substruction

    English

    Noun

    (en noun)
  • (architecture) underbuilding; the foundation, or any preliminary structure intended to raise the lower floor or basement of a building above the natural level of the ground
    • It is a magnificent strong building, with a substruction very remarkable. — Evelyn.
    (Webster 1913)