What are benign tumors?

Omas (Fibroma, chondroma..), adenoma (epithelia produce gland like structures derived from glands lack glandular growth pattern,) Papilloma (produce fingerlike fronds in epithelia), Polyps (not usually tumors more inflammatory, some are malignant tumors, mass above mucosal surface), Cystadenomas (hollow cystic masses, mostly in ovaries)