The word "extravenate" is not a commonly used word in English, but its spelling can be phonetically explained using the International Phonetic Alphabet (IPA). The word is pronounced as /ɛkstrəvəneɪt/, which can be broken down as follows: "ekstrə" for the "extra" part, which is pronounced as /ˈɛkstrə/ with stress on the first syllable, and "vəneɪt" for the "venate" part, which is pronounced as /vəneɪt/ with stress on the second syllable. Overall, the word has a total of four syllables and can be challenging to spell without prior knowledge of IPA.