You can make a sentence that has an interrogative adverb. For example,
Tell me why you did it.
I don't know which one is better.
What do you say the sentence? As far as I remember, you have the name.
Tell me why you did it . I don't know which one is better . The two underlined expressions are subordinate interrogative clauses (embedded questions).
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Tell me why you did it.
I don't know which one is better.
The two underlined expressions are subordinate interrogative clauses (embedded questions). The meanings, respectively, are:
"Tell me the answer to the question 'Why did you do it?'"
"I don't know the answer to the question 'Which one is better?'"