* The cat chased the mouse. (Two nouns: cat and mouse)
* My friends and I went to the park. (Three nouns: friends, I, park)
* The red car, the blue truck, and the yellow bus were all parked in the lot. (Six nouns: car, truck, bus, lot, red, yellow)
Nouns can function as subjects, objects, or even modifiers in a sentence. It's quite common to have several nouns within a single sentence, especially in longer and more complex sentences.