> PHD, MD, DDS, DO, OBGYN PhD is an "almost initialism" :P and would be very hard to read without spelling out the letters. MD, DDS and DO are initialisms and

> PHD, MD, DDS, DO, OBGYN PhD is an "almost initialism" :P and would be very hard to read without spelling out the letters. MD, DDS and DO are initialisms and there's no other way to read it. ObGyn is more of an acronym and it would make sense to read it as a word.