The difference between Defect and Lapse

Defect as a noun:

A fault or malfunction.

Defect as a noun:

The quantity or amount by which anything falls short.

Defect as a noun (math):

A part by which a figure or quantity is wanting or deficient.

Defect as a verb (intransitive):

To abandon or turn against; to cease or change one's loyalty, especially from a military organisation or political party.

Defect as a verb (military):

To desert one's army, to flee from combat.

Defect as a verb (military):

To join the enemy army.

Defect as a verb (law):

To flee one's country and seek asylum.

Lapse as a noun:

A temporary failure; a slip.

Lapse as a noun:

A decline or fall in standards.

Lapse as a noun:

A pause in continuity.

Lapse as a noun:

An interval of time between events.

Lapse as a noun:

A termination of a right etc., through disuse or neglect.

Lapse as a noun (meteorology):

A marked decrease in air temperature with increasing altitude because the ground is warmer than the surrounding air.

Lapse as a noun (legal):

A common-law rule that if the person to whom property is willed were to die before the testator, then the gift would be ineffective.

Lapse as a noun (theology):

A fall or apostasy.

Lapse as a verb (intransitive):

To fall away gradually; to subside.

Lapse as a verb (intransitive):

To fall into error or heresy.

Lapse as a verb:

To slip into a bad habit that one is trying to avoid.

Lapse as a verb (intransitive):

To become void.

Lapse as a verb:

To fall or pass from one proprietor to another, or from the original destination, by the omission, negligence, or failure of somebody, such as a patron or legatee.