The dictionary I am writing has the defined word/words in TNR. The rest of
the definition is in a different font. Is there a way to find the end of the
TNR text for each defined word or phrase and add a space there?

Use replace with the wildcard option set to locate

([a-zA-Z]{1,})
format > font > Times New Roman
with
\1[space]
where [space] is an actual space.

The above assumes single words
http://www.gmayor.com/replace_using_wildcards.htm
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Graham Mayor - Word MVP

My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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Guy Lydig wrote:
> The dictionary I am writing has the defined word/words in TNR. The
> rest of the definition is in a different font. Is there a way to find
> the end of the TNR text for each defined word or phrase and add a
> space there?