challenges
"Challenges" is a very common English word with a few closely related but distinct meanings. It works both as a noun (plural) and as a verb (the third-person singular present form of "to challenge"). Here are the most important senses you'll encounter.
When you challenge an idea, a decision, or a statement, you are saying 'I don't think this is right' and asking for it to be reconsidered or proved. You are pushing back against something.
law, academia, everyday language · Modern, widely used
She challenges the assumption that success only comes from hard work.
The student challenges the teacher's explanation with a thoughtful question.