Coconut and Think tank

Coconut noun - Large hard-shelled oval nut with a fibrous husk containing thick white meat surrounding a central cavity filled (when fresh) with fluid or milk.

Think tank and coconut are semantically related. in head topic. In some cases you can use "Think tank" instead a noun "Coconut", when it comes to topics like top part of an animate body.

Think tank noun - A company that does research for hire and issues reports on the implications.

Coconut and think tank are semantically related. You can use "Coconut" instead a noun phrase "Think tank".