breakthrough

As nouns the difference between inroads and breakthrough

is that inroads is while breakthrough is (military) an advance through and past enemy lines.

As an adjective breakthrough is

characterized by major progress or overcoming some obstacle.

As an adjective breakthrough is

characterized by major progress or overcoming some obstacle.

As a noun breakthrough is

(military) an advance through and past enemy lines.

As nouns the difference between progress and breakthrough

is that progress is movement or advancement through a series of events, or points in time; development through time while breakthrough is an advance through and past enemy lines.

As a verb progress

is to move, go, or proceed forward; to advance.

As an adjective breakthrough is

characterized by major progress or overcoming some obstacle.

As nouns the difference between development and breakthrough

is that development is the process of developing; growth, directed change while breakthrough is an advance through and past enemy lines.

As an adjective breakthrough is

characterized by major progress or overcoming some obstacle.

In sports terms the difference between breakthrough and breakdown

is that breakthrough is the penetration of the opposition defence while breakdown is a loss of organization (of the parts of a system).

As nouns the difference between breakthrough and breakdown

is that breakthrough is an advance through and past enemy lines while breakdown is a failure, particularly mechanical; something that has failed.

As an adjective breakthrough

is characterized by major progress or overcoming some obstacle.

As nouns the difference between breakthrough and milestone

is that breakthrough is an advance through and past enemy lines while milestone is a stone milepost (or by extension in other materials), one of a series of numbered markers placed along a road at regular intervals, typically at the side of the road or in a median.

As an adjective breakthrough

is characterized by major progress or overcoming some obstacle.

As a verb milestone is

to place milestones along (a road, etc.).