Feature request: ability to exclude a term from lookup, depending on surrounding words

Example:
If you have "Enterprise" in the glossary, but some pages contain the phrase "The Starship Enterprise" then it would be helpful to not have the glossary term highlighted in that phrase.

Other examples would be words with meanings that depend on context, eg lookup American (definition: USA) but not North American (which includes Canada).

A possible way to indicate this would be to add a parameter called exclude or to use ! before the excluded word in the list of synonyms, e.g.

;American, !North America
:From the United States of America.