Hi! I'll check your list and make small corrections. Below I give a clean version of each phrase, the full phrase you would use in a sentence, and short, easy rules so you can do this yourself next time.
Corrected short labels
- Round target
- Oval-shaped swing chair
- Globe (use "globe" instead of "spherical globe")
- Square map
- Rectangular flag
- Cubic street organ (or cube-shaped street organ)
- Triangular sign
- Diamond-shaped kite
- Pyramid-shaped tent
- Cylindrical crawling tunnel
- Trapezoid-shaped boat (or trapezoidal boat)
- Star-shaped piñata
- Hexagonal spider web
- Heart-shaped glasses
Full phrases (with articles) — good for sentences
- a round target
- an oval-shaped swing chair
- a globe (not "a spherical globe" — that is repetitive)
- a square map
- a rectangular flag
- a cubic street organ (or a cube-shaped street organ)
- a triangular sign
- a diamond-shaped kite
- a pyramid-shaped tent
- a cylindrical crawling tunnel
- a trapezoid-shaped boat (or a trapezoidal boat)
- a star-shaped piñata
- a hexagonal spider web
- a pair of heart-shaped glasses (we say "a pair of" because "glasses" is plural)
Simple rules and explanations (step by step)
- Use a hyphen for compound adjectives before a noun: When two words together describe a noun, put a hyphen between them: "diamond-shaped kite," "oval-shaped swing chair." If the description comes after the noun, you usually don't need the hyphen: "The kite is diamond shaped."
- Choose "a" or "an" by sound: Use "an" before vowel sounds (an oval...), and "a" before consonant sounds (a square..., a cylindrical...).
- Avoid repetition: Some words are already clear about shape. "Globe" already means round, so "spherical globe" is repetitive. Just use "globe."
- Plural words: For things that are always plural (like glasses), say "a pair of glasses" when you want one object: "a pair of heart-shaped glasses."
- Use correct hyphen character: Use a normal hyphen (-) for compound words, not a long dash.
- Capitalization: For a simple list, you can start each item with a capital letter or keep all lowercase — both are okay. In sentences, follow normal capitalization rules.
If you want, I can also rewrite the list in title case, lower case, or make short labels for a poster. Great job — these were easy fixes!