The word "verb" is really a noun, and "indescribable" is actually a descriptive word.
Sources: verb, indescribable
There's more where those came from:
"Adjective", "adverb", "preposition" (all parts of speech actually) are all nouns as well. "Infinite" is actually a finite word. "Unpronounceable" is a pronounceable word. "Spanish" is an English word. "Invisible" is a word that you can see. "Monosyllabic" is a pentasyllabic word.
You can try to make your own at home!
