The correct spelling for "un accustoms" is actually "unaccustoms". In IPA phonetic transcription, this word would be pronounced as /ʌnəˈkʌstəmz/. The spelling of this word follows the common prefix "un-" which means "not", and the verb "accustoms" which means to make someone familiar with something. The hyphen is removed to form one word, and the final "-s" is added to agree with the third person singular subject. The correct spelling and pronunciation of words is an important aspect of effective communication.
The term un accustoms is not a recognized word in standard English. It appears to be a combination of the prefix un- (meaning not or the opposite of) and the verb accustoms (which is the third person singular form of accustom).
The etymology of accustom can be traced back to the Latin word consuetudinem, which means habit or custom. In Middle English, it evolved to accustomen, and eventually in Modern English, it became accustom.
It's worth noting that unaccustomed is a more commonly used form of the word, and it means not familiar or not used to something. For example, you might say I am unaccustomed to public speaking.