What is the masculine noun for girl-guide?

There isn't a direct masculine noun for "girl-guide." The term "girl-guide" is specifically used for female members of the scouting movement.

Here's why there isn't a direct equivalent:

* Gender-neutral alternative: The scouting movement uses the term "scout" as a gender-neutral term for both boys and girls.

* Historically: While there were separate organizations for boys and girls in the early days of scouting, today the Boy Scouts and Girl Scouts have merged in many regions, using the term "scouting" for both genders.

So, instead of searching for a masculine noun, it's best to use the gender-neutral term "scout" when referring to both boys and girls in the scouting movement.