What's the difference between lenitive and lenitiveness?

Lenitive

Definition:

• (a.) Having the quality of softening or mitigating, as pain or acrimony; assuasive; emollient.
• (n.) A medicine or application that has the quality of easing pain or protecting from the action of irritants.
• (n.) A mild purgative; a laxative.
• (n.) That which softens or mitigates; that which tends to allay passion, excitement, or pain; a palliative.

Example Sentences:

• (1) The host snail was collected from a lenitic biotope belonging to the Riachuelo basin (Corrientes province, Argentina) during 1985-1986.
• (2) In large part, the observed variability can be explained in terms of changes due to feature spreading and lenition.

Lenitiveness

Definition:

• (n.) The quality of being lenitive.

Example Sentences:

• (1) The host snail was collected from a lenitic biotope belonging to the Riachuelo basin (Corrientes province, Argentina) during 1985-1986.
• (2) In large part, the observed variability can be explained in terms of changes due to feature spreading and lenition.