Identify the word which remains the same in its plural form:

✅ কেন সঠিক: ‘Aircraft’ has the same form in the singular and the plural: one aircraft, two aircraft.

❌ অন্য অপশন: intention → intentions, mouse → mice, thesis → theses — all change in the plural.

💡 মনে রাখুন: Same singular and plural: aircraft, sheep, deer, series, species, swine.

📖 শব্দার্থ: aircraft — উড়োজাহাজ।