Is rebuff greek or latin?

Eimi is the Greek equivalent of 'I am'. There are no infinitives in modern Greek. Esse is the Latin equivalent of 'to be'.

Hepatitis. Hepatitis comes from ancient Greek hepar (ηπαρ) or hepato- (ηπατο-) meaning 'liver' and suffix -itis denoting 'inflammation' (c.1727).11. http://en.wikipedia.org/wiki/Hepatitis

The answer depends on whether you want to learn Latin or Greek.

Greek ,from αδένας ΑΔΕΝΑΣ =gland

Spect- is Latin for See or Look