Acute
New onset, likely concerning. Opposite of chronic
Chronic
Long-standing, constant. Opposite of acute
Benign
Normal, of no danger to health
-ectomy (suffix)
Surgical removal (e.g. tonsillectomy)
-itis (suffix)
Inflammation (e.g. appendicitis)
-scopy (suffix)
Viewing with a scope (e.g. colonoscopy)