covanent

As a noun contract is

an agreement between two or more parties, to perform a specific job or work order, often temporary or of fixed duration and usually governed by a written agreement.

As an adjective contract is

(obsolete) contracted; affianced; betrothed.

As a verb contract is

(ambitransitive) to draw together or nearer; to shorten, narrow, or lessen.

Covanent is likely misspelled.

Covanent has no English definition.

As a noun nunnery is

a place of residence for nuns; a convent.