* Aunt Jane: This is a noun phrase, specifically a proper noun, referring to a specific person.
* understanding: This is a noun, referring to the state of comprehending something.
* habits: This is a noun, referring to the usual patterns of behavior.
* whales: This is a noun, referring to a type of marine mammal.
The sentence is a bit unusual in its structure, but we can understand that Aunt Jane has an understanding of the habits of whales.
Therefore, the nouns are:
* Aunt Jane
* understanding
* habits
* whales