How can I create a list of specific words used in a document without creating
a separate marking for them, such as the index uses. Is there anyway to use
a style that could create a list (using a character style that feeds into a
TOC entry). It will only be words, not complete sentences.

The issue with a "marked text - duplicate selection of text being created"
is ensuring that edits are made in the "marked text area" as well.
Wordperfect had a listing feature that marked the actual selected text and it
did not create a duplicate area. Thanks in advance for any ideas or
suggestions.