I often hear someone says, "Wow, that's such a nice thought!"
Movies and books often have that kind of dialogue as well.
As I figure it out, "a nice thought" is a noun phrase. Which means "nice" is a complementary for "thought", and "thought" is literally a noun.
I'm also aware that thought is a third form (or second) of think, and dictionaries say that thought is a noun, too.
But why not use thinking (gerund) instead of thought? As I understand it, gerund has a function to make a verb-ing function as a noun.
Are there other third-form verbs that also function as nouns? Or is it just thought?