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I'd like to know why LTspice simulates a TVS diode as a zener, even though its behavior isn't exactly the same.
I'd also like to know where I can find an LTspice library for some TVS diodes, for example, that are 15 volts and others that are around 140 volts, and that are bidirectional.

Did you try looking on the sites of manufacturers that make TVS diodes, e.g. Diodes Inc., Littelfuse, Vishay etc?

You could always try looking on the group's Files section and put "TVS" in the search box in the top right. I got 24 hits, but not all them were relevant.

As far as LTspice simulations are concerned, actually unidirectional TVSs are similar to Zeners, but tend to higher current. Bidirectional ones are equivalent to two unidirectional ones in anti-series.