Step 1: Recall from passage.
The passage clearly states that the botanical name of coconut is Cocos nucifera.
Step 2: Eliminate incorrect options.
- Papaya → Botanical name is Carica papaya.
- Arecanut → Botanical name is Areca catechu.
- Cashew nut → Botanical name is Anacardium occidentale.
Step 3: Conclusion.
Thus, Cocos nucifera refers to Coconut.
Final Answer: \[ \boxed{\text{Cocos nucifera = Coconut.}} \]