Nice list! I checked the grammar and fixed small issues. Below is the corrected list followed by a few simple rules so you can make more corrections yourself.
- round target
- oval-shaped swing chair
- spherical globe
- square map
- rectangular flag
- cubic street organ
- triangular sign
- diamond-shaped kite
- pyramid-shaped tent
- cylindrical crawling tunnel
- trapezoid-shaped boat
- star-shaped piñata
- hexagonal spider web
- heart-shaped glasses
Short rules (easy to remember):
- Capitalization: Don’t capitalize words in the middle of a list unless they are names or start a sentence. So use lowercase like round target.
- Hyphens: Use a hyphen when you make a compound adjective with "-shaped" before a noun (for example, oval-shaped swing chair, diamond-shaped kite).
- Single-word shape adjectives are fine without a hyphen (for example, round, square, rectangular, cylindrical).
- Watch for punctuation: use a regular hyphen (-) not an en dash (–) for words like "diamond-shaped".
- Style note: Some phrases are a bit redundant (for example, a "globe" is already spherical), but they are grammatically correct.
If you want, I can also rewrite the whole list as full sentences (for example, "The kite is diamond-shaped."), or check for simpler words for a 10-year-old.