maintenance

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.

As a noun maintenance is

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

As nouns the difference between safeguard and maintenance

is that safeguard is something that serves as a guard or protection; a defense while maintenance is actions performed to keep some machine or system functioning or in service.

As a verb safeguard

is to protect, to keep safe.

Maintenance is a synonym of keeping.

As nouns the difference between maintenance and keeping

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

As a verb keeping is

.

As nouns the difference between maintenance and safeguarding

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

As a verb safeguarding is

present participle of lang=en.