* Many words are ambiguous: Words like "Jabberwock," "Jubjub," "Bandersnatch," and "Frumious" are likely nouns in context, but aren't recognizable English nouns.
* Proper nouns: The names "Callooh! Callay!" and "The Jubjub bird" could be considered proper nouns, adding to the count.
* Figurative language: Phrases like "the slithy toves" and "the frumious Bandersnatch" use adjectives but imply noun-like entities.
So, the answer depends on how strictly you define "noun." A basic count of recognizable English nouns gives a low number, but if you include nonsense words and figurative language, the number significantly increases.
For a fun exercise, try counting the nouns yourself! See what categories you use and how your definition of "noun" affects the final number.