Does a library for pre-built normal objects exist?(Car, tree, animal, house, road, human etc.)

Hey, I am a noob to unity, so my terminology or expectations might be wrong and I hope you guys forgive me for that. I am basically looking for a pre-built collection of simple objects, like trees, normal objects, animals, humans etc. This does not specifically need to be 3D, and 2D is also fine.

My specific use-case is to create a scene when supplied normal sentences(after some NLP to identify nouns, adjectives etc.), and thus I need pre-fabricated objects for the same.

Have you looked in the asset store? There are all kinds of objects available there.

Have you looked into the AssetStore?