Anatahan is a proper noun which refers to a small island in the northern Marianas. However, if we consider the word as a common noun, there are no synonyms for it. The word 'anatahan' cannot be interpreted as a concept or idea because it is a specific name. It's always important to remember that proper nouns don't have synonyms, and they cannot be replaced with another noun. If we want to refer to this island, we need to use the name 'Anatahan' specifically. Therefore, we can't use other words or phrases to replace it and convey the same meaning as 'anatahan'.