I can give you several sentences.
The word "depravity" is a noun. An example of a sentence using the word would be: She was kind and generous, but she was also vulnerable to the depravity of others.
Her openness left her vulnerable to the evil forces.
I felt vulnerable because the door could not be locked. The outlying parts of the empire proved vulnerable to attacks by enemies. With proper protection, a computer is vulnerable to viruses and other malware.
Since the word vulnerable means susceptible to an attack, a sentence using vulnerable could be as follows. Woman who walk alone at night often feel vulnerable unless they have something to defend themselves with.
Pregnable means to be vulnerable. A good sentence would be, she felt pregnable so she carried mace and a gun with her at all times.
You just used the word acolytes in a sentence. Even saying, "can the word acolytes be used in a sentence", you are using that word in a sentence.
No, the word "vulnerable" is an adjective.
The word "incidentally" can be used at the end of a sentence. You can make the sentence "This was done incidentally.".
I felt very vulnerable, standing there without any clothes on.
You just used it in a sentence.
This is your umpteenth request for a word to be used in a sentence.
"Rang" is the past tense of the verb "ring." For example, "She rang the bell to signal the start of the event."