noun
coconut palm
Refers to the tree Cocos nucifera. Usually written in katakana.
南の島にはココヤシがたくさん生えている。
Many coconut palms grow on the southern island.
ココナッツ refers to the fruit or its edible parts, while ココヤシ refers to the tree itself.
From English 'coco' + Japanese 椰子 (やし, 'palm tree').