What's the difference between countermine and counterplot?

Countermine

---

Definition:

• (n.) An underground gallery excavated to intercept and destroy the mining of an enemy.
• (n.) A stratagem or plot by which another sratagem or project is defeated.
• (v. t.) To oppose by means of a countermine; to intercept with a countermine.
• (v. t.) To frustrate or counteract by secret measures.
• (v. i.) To make a countermine or counterplot; to plot secretly.

Example Sentences:

Counterplot

---

Definition:

• (v. t.) To oppose, as another plot, by plotting; to attempt to frustrate, as a stratagem, by stratagem.
• (n.) A plot or artifice opposed to another.

Example Sentences: