Question: is warum a subordinating conjunction?
Answer: Different types of subordinate clauses Subordinate clauses can also be introduced by “ob” (whether) or question words such as “wer” (who), “wie” (how), “wann” (when) or “warum” (why) – in indirect questions, as well as by “der”, “die”, “das” (who) or “deren” (whose) – in relative clauses.