maintenance

As a verb renovating

is .

As a noun maintenance is

actions performed to keep some machine or system functioning or in service.

Maintenance is a synonym of sustaining.

As a noun maintenance

is actions performed to keep some machine or system functioning or in service.

As a verb sustaining is

.

As nouns the difference between operations and maintenance

is that operations is while maintenance is actions performed to keep some machine or system functioning or in service.

As a noun maintenance is

actions performed to keep some machine or system functioning or in service.

As nouns the difference between maintenance and testing

is that maintenance is actions performed to keep some machine or system functioning or in service while testing is the act of conducting a test; trialing, proving.

As a verb testing is

present participle of lang=en.

As an adjective testing is

difficult, tough.

Maintenance is a synonym of livelihood.

As nouns the difference between maintenance and livelihood

is that maintenance is actions performed to keep some machine or system functioning or in service while livelihood is (obsolete) the course of someone's life; a person's lifetime, or their manner of living; conduct, behaviour.

Maintenance is a related term of safekeeping.

As nouns the difference between maintenance and safekeeping

is that maintenance is actions performed to keep some machine or system functioning or in service while safekeeping is the act of keeping something safe; protection from harm, damage, loss, or theft.

Defence is a synonym of maintenance.

As nouns the difference between defence and maintenance

is that defence is the action of defending, of protecting from attack, danger or injury while maintenance is actions performed to keep some machine or system functioning or in service.

As a verb defence

is (obsolete|transitive) to furnish with defences; to fortify.