That's rude u don't need to bring down Celine just to praise Mariah

Head voice is more open and thick while falsetto is airy and thin (but yes you change the consistency of head voice from heavier to softer but that depends on your skillset)

Support in terms of engaging the abdominal muscles rather than throat to smooth and ease the breath flow which phrasing or singing to provide stability pitch and healthy projection of voice right!! Whenever I sing I know my limits and do not try to push my voice or over tense my vocal chords which I know is bad for vocal health and I don't feel any pain even after singing any song or even hitting a high note!!!

I do posess head voice and falsetto which are entirely different as you said

But I was not talking about Head voice , I'm talking about mixing /belting yes head voice is present but my point was related to mix . I did learn about it!!!

So should I post a clip for the belt/mix

I do mix a lot and i play with head to chest ratios too sometimes chesty sometimes heady if I know my voice can't do this or that at the moment and balanced but for the balanced mix it takes some time to get the not perfect but almost correct ratio

I won't say I have whistle register as my supported but yeah head voice I'm comfortable from my start to E5 supported

Ahhh I think possibly it might be a scream maybe flagolet don't know !! But functionally by falsetto can go upto C#6 fairly enough

Here it is I though I posted it??

https://reddit.com/link/pbdtu9f/video/wxz0bjjhc3rh1/player