Explanation: The word "pneumonia" is derived from the ancient Greek word "πνευμονία" (pneumonía), which means "lung condition." In Greek, the initial 'p' in "πνεύμων" (pneumón), meaning "lung," was silent. When the word was adopted into English, the silent 'p' was retained, resulting in the pronunciation "new-MOH-nee-uh" or "noo-MOH-nee-uh" in English, depending on regional accents.

The other words, "psychology," "psycho," and "psychiatrist," have pronounced 'p' sounds because their etymologies differ. "Psychology" comes from the Greek word "ψυχή" (psychḗ), meaning "soul" or "mind," and "λόγος" (lógos), meaning "study" or "science." "Psycho" is an abbreviation of "psychopath" or "psychotic," both of which derive from "psychḗ." "Psychiatrist" combines "psyche" and "-iatry," from the Greek "iatreia," meaning "healing" or "medicine," and it also retains the pronounced 'p' sound.

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