For example, if you say 正方形の you can describe something as being square, right? But if I say ピラミッドの, is that breaking any grammar rules or does it give the same effect? Because I see on Jisho.org all the time words that say no-adj, and then I'll see other nouns that don't say that listed as their part of speech, and I don't know why something being listed as a no-adj really matters. Can only certain nouns be used descriptively (the ones listed as no-adj), or can they all if you slap の on, and this no-adj part of speech has some other significance?
I also sometimes see words listed as both na-adjs AND no-adjs…so how do I know when to use な vs の in these situations?
by azzeeter