Which word is not an adjective?

Which word is not an adjective? Correct Answer Hammer

Solar (adj) - সূর্য সংক্রান্ত, সৌর; Polar (adj) - মেরুসম্বন্ধীয়, মেরু; Linear (adj) - রৈখিক, রেখা সংক্রান্ত; Hammer (n) হাতুড়ি। এখানে Hammer হলো noun. অন্য শব্দ তিনটি হলো adjective । সঠিক উত্তর (ঘ)।

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