[atoav]

JWST shows a much bigger part of the wavelength spectrum. That means it can image things that would just not show up in Hubble.

E.g. think about far away galaxies that have been redshifted so much (due to the expanding universe) that they fell below the lower wavelength threshold of Hubble.

[Synaesthesia]

Yes, also cooler objects show up, which are otherwise invisible and you can see through interstellar dust and clouds better.