Got it easily but my (correct) answers didn't match accepted answers.

Broadening your linking terms will make for a more satisfying solve, regardless of how easy. No fun to get a puzzle this easy half 'wrong'.

I called the "materials" group "fabrics" which was not accepted as correct. Materials is too wide a name. Wood is a material too, but wouldn't fit in this particular group.

easy - but the words didn't match accepted answers. I called the 4 sided shapes group quadrilaterals and it told me I was incorrect, fabric was called incorrect and I spelled colours in UK English rather than US English and was told I was incorrect.
Need more terms.