Question

he tossed coffee grounds in the gardens on the school grounds. noun & noun noun & verb

Explanation:

In the sentence "He tossed coffee grounds in the gardens on the school grounds", the word "grounds" appears twice. In "coffee grounds", "grounds" is a noun (referring to the solid residue of coffee). In "school grounds", "grounds" is also a noun (referring to the land or area of the school). So it's a case of noun & noun.

Answer:

noun & noun