are major chords just min7 chords without root ? No, same answer for your question, No.
If you start doing that then you will remove any kind of structure of harmony, is like if I ask,
what chord is Bb+D+F# ?
Bbaug ? no, is GmM7 just omit root :D... no, is Em9(b5) just omit root and 3rd :musicwhistle:... no, it's actually C7(#11) just omit root, 3rd and 5th, :w00t: ... no, it's really Ab9#5#11#13