Meaning of なことば in Japanese

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Definition of なことば

めいし(meishi) · なことば(nakotoba) 【名詞】

(n) (ling) noun
名詞を修飾するもの（形容詞、または形容詞相当語句）。
Things that modify nouns (adjective, or adjectival equivalent).

はなことば(hanakotoba) 【花言葉 ·花詞】

(n) language of flowers; floriography; flower symbolism, e.g. red roses mean love

おんなことば(onnakotoba) 【女言葉 ·女ことば】

I'm always writing weird and hoopy stuff so I'm sure it's difficult to comment on.

My brother is always acting foolishly.

Will you please put that in simpler words?

You'll regret having said those words.

The right word for this does not come to me.