Choose the incorrectly spelt word.

Obsreve

The incorrectly spelt word is Obsreve. The correct spelling is Observe.

Here is a breakdown of the spelling of each word:

• Observe should be spelled correctly. It means to pay attention to something and to take notice of it.
• Club is spelled correctly. It is a heavy stick or bat used for hitting or striking things.
• Bulb is spelled correctly. It is a round, fleshy part of a plant that contains the plant's reproductive organs.
• Thunder is spelled correctly. It is a loud, rumbling noise caused by lightning.