BuddyPress.org

It’s always worth to check the docs first:

https://codex.buddypress.org/how-to-guides/changing-internal-configuration-settings/ will give you some hints.

You don’t need to touch core files, you could do it by defining your own “SLUG” in wp-config.php – however docs say nothing about a “FORUMS” Slug – I would suggest to search the buddypress files for something like this.

Change the URL slugs of BuddyPress components:

define ( ‘BP_ACTIVITY_SLUG’, ‘streams’ );

define ( ‘BP_BLOGS_SLUG’, ‘journals’ );

define ( ‘BP_MEMBERS_SLUG’, ‘users’ );

define ( ‘BP_FRIENDS_SLUG’, ‘peeps’ );

define ( ‘BP_GROUPS_SLUG’, ‘gatherings’ );

define ( ‘BP_MESSAGES_SLUG’, ‘notes’ );

define ( ‘BP_WIRE_SLUG’, ‘pinboard’ );

define ( ‘BP_XPROFILE_SLUG’, ‘info’ );

define ( ‘BP_REGISTER_SLUG’, ‘signup’ );

define ( ‘BP_ACTIVATION_SLUG’, ‘enable’ );

define ( ‘BP_SEARCH_SLUG’, ‘find’ );

define ( ‘BP_HOME_BLOG_SLUG’, ‘news’ );

Great, you’re welcome.

i complement the docs with “BP_FORUMS_SLUG”.