Topics - This is a tool seeing how each topic or term cluster is distributed across the document or corpus.The tool is designed to help you understand what topics exist and how they are distributed. If you have a single document in your corpus the document can be divided into segments of equal length for the topic modeling.
Word Tree - This is a tool allowing you to explore how keywords are used in different phrases in the corpus. This can help you to understand how the keyword is distributed across different phrases.
(Source: https://voyant-tools.org/docs/#!/guide/start)
