The object of a preposition
the subject of a sentence.
n is always

The object of a preposition is the noun or pronoun governed by a preposition. The object of a preposition is usually (but not always) the noun or pronoun to the right of the preposition.

The subject is sometimes called the “naming part” of a sentence or clause. It shows what the sentence is about, or who or what is performing an action in the sentence. The subject is most often a noun, pronoun, or noun phrase.

Explanation:

Please stay safe!

I sorted the words from 1 to 7 because this website thinks those are inappropriate words

1 should be 5

2 should be 1

3 should be 6

4 should be 2

5 should be 3

6 should be 7

7 should be 4