What is the Suffix of the word hematology

What is the Suffix of the word hematology?  What is the meaning of the suffix in the word above?  What is a combining vowel in a medical term?  Does the medical term electrocardiogram have how many combining vowels?  In the above term What does the suffix mean? . In the term in question 4 what is the common abbreviation used for it?  Gastroenterology means what? B. In the terms below using slashes divide the terms into their component parts and give the meaning for the whole term