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Do you mean major second as in G dom.7th we have F against G?
That's really a 7th, because it's the root G against the 7th above, F.
I'm not quite sure what you mean with your question though.
In classical music and onwards, you can freely use the dissonance of the 7th etc. without preparation. (Preparing a dissonance is when the dissonant note is sounded in a previous harmony, where it is consonant, if you're getting what I'm saying).
So you can use a 7th chord freely, and it's not classified as passing. That really only counts for second inversion chords.
If you would like me to illustrate these points with music, then ask.
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