Correct spelling for the English word "superfluentest" is [sˈuːpəflwˈɛnte͡ɪst], [sˈuːpəflwˈɛnteɪst], [s_ˈuː_p_ə_f_l_w_ˈɛ_n_t_eɪ_s_t] (IPA phonetic alphabet).
The word "superfluentest" does not have an established etymology as it does not seem to exist in the English language. However, it appears to be derived from the root word "superfluous", which comes from the Latin word "superfluus" meaning "overflowing, excessive, unnecessary". The "-est" suffix is often added to adjectives in English to express the superlative degree, indicating the highest or greatest level of a quality. Therefore, "superfluentest" could potentially be a hypothetical superlative form of "superfluent", although it is not commonly used or recognized in English.