Page 82 of Fluent Forever's "Awesome Word List" for Japanese says that ピンク is a noun or a な-adjective. However, jisho.org says it's a の-adjective, and I recall hearing elsewhere that it is a の-adjective. I tried checking Wiktionary, but neither the English-language nor Japanese-language editions mentioned what particle it uses.
As a general side-question, do words either only use な or only use の, or do some words sometimes use either of them?
