Compound words

What do you call a word made by joining 'play' and 'ground'?

• Playball

• Playground

• Playhouse

• Playroom

Which of these is a compound word with a different meaning than its parts?

• Watermelon

• Waterbottle

• Watertap

• Waterglass

In the sentence 'My bedroom is my favorite place in the house', which word is a compound word?

• Bedroom

• Favorite

• Place

• House

Which of these words is made by joining 'cup' and 'cake'?

• Cupstand

• Cupholder

• Cupcake

• Cupboard

Which of these is a compound word?

• Starlight

• Starship

• Starboard

• Starfish