Silent N
when ⟨n⟩ is not pronounced
⟨mn⟩ — silent N at the end of a word
The letter ⟨n⟩ is silent at the end of a word after ⟨m⟩.
The N comes back: The silent ⟨n⟩ often returns when you add a suffix. Compare column (silent n) with columnist, or condemn with condemnation.