@royal Good question! Yep, "bagyo" applies to any storm and typhoon. It's only in Philippine English that we have two words for it. 😅
I'm not sure when it happened. But IIRC, back in the 90s, "storm" and "typhoon" were the same. I guess it was part of PAGASA's (Philippine meteorology agency) to make it easier to distinguish what is weak vs powerful "storms"/"typhoons".
Oh, we still don't use "hurricane", it's still reserved for the Western hemisphere.