The word "doablest" is spelled as /ˈduːəbləst/. It is derived from the word "doable", which means something that can be done or accomplished. The suffix "-est" is added to the end of the word to indicate the superlative form. Therefore, "doablest" means the most doable or achievable. While it may not be a commonly used word, it highlights the grammatical feature of adding the suffix "-est" to form the superlative degree of adjectives.