20 14 graduates are 20 14 graduates. If you count by which session, you must consider the history of the school.
For example, a university was founded in 20 14, the first batch of students enrolled in 20 14, and graduated four years later, that is, 20 18 years. This year's graduates are the first graduates of this school, and so on, and the graduates of 20 19 are the second graduates.
Difference from "grade":
1, with different usage.
Graduates are generally called "classes". For example, the class of 20 19 graduated in June and July this year. The students enrolled in September are in grade 20 19.
2. Different meanings
"Session" refers to the graduation year of students, such as 20 17, 20 18, etc. "Grade" refers to the academic year of students, such as grade 20 18, grade 20 19, etc.