Puffer and Steamboat

Puffer noun - Any of numerous marine fishes whose elongated spiny body can inflate itself with water or air to form a globe; several species contain a potent nerve poison; closely related to spiny puffers.

Steamboat and puffer are semantically related. In some cases you can use "Steamboat" instead a noun "Puffer".

Steamboat noun - A boat propelled by a steam engine.

Puffer and steamboat are semantically related. You can use "Puffer" instead a noun "Steamboat".