keep.
example: I maintain my house.
preserve
maintenance
management, supervision, maintenance
maintenance care
Maintenance Officer
Care for and encourage the growth or development
The base word for maintenance is "maintain."
maintenance (you were correct)
The word sustentation means maintenance in being or activity. Other words for sustentation are conservation, preserving, upkeep, maintenance, keep, and care.
Another word for sustenance is "nourishment." It refers to the means of sustaining life, particularly through food, but can also encompass support or maintenance in a broader sense. Other synonyms include "support," "sustaining," and "provision."
1) maintenance engineer. 2.) minister of maintenance.
suffragium
'Entretien'