If and Question mark

If noun - Something taken as being true or factual and used as a starting point for a course of action or reasoning.

Question mark and if are semantically related. In some cases you can use "Question mark" instead a noun "If".

Question mark noun - A punctuation mark (?) placed at the end of a sentence to indicate a question.

If and question mark are semantically related. Sometimes you can replace term "If" with "Question mark", this terms are similar.