Augmentative

Part of speech: noun (n.)

A word which expresses with augmented force the idea or the properties of the term from which it is derived; as, dullard, one very dull. Opposed to diminutive. Gibbs.

Part of speech: adjective (a.)

Having the quality or power of augmenting; expressing augmentation. -- Aug*ment"a*tive*ly, adv.