a regular expression that matches non-specific words

I'm worried because I can't use regular expressions that match only certain words.

If you want to find a word that is not int, I wrote the following:

\b(?!int).)*\b

If you search for the following expressions in this regular expression, everything will not get stuck.

int integer interval

I don't want int to get stuck, but what regular expressions should I use when I want to search integer or interval?

Please let me know if anyone understands.