Synonyms: stimulus, impetus, spur, boost, encouragement

Antonyms: curb, deaden, discourage

Example Sentence: The infrastructure projects unveiled yesterday were not unexpected, but will give a welcome fillip to the construction sector.

3. Viability (Noun) : व्यावहारिकता: the ability to work successfully

Synonyms: feasibility, potentiality, possibility, credibility

Antonyms: improbability, unlikelihood, doubtfulness

Example Sentence: Rising costs are threatening the viability of many businesses.

4. Photovoltaic (Noun): relating to the production of electric current at the junction of two substances exposed to light

Synonyms: photoelectric, solar and voltaic.

Example Sentence: Hoffman Electronics produced photovoltaic cells that were 9 percent efficient, and then the following year those cells were used to power Vanguard I, the first satellite to use PV technology for power.

5. Coup (Noun) : तख्तापलट : a sudden illegal, often violent, taking of government power, especially by part of an army; an instance of successfully achieving something difficult

Synonyms: upheaval, unrest, success, accomplishment

Example Sentence: It was a tremendous coup for the local paper to get an exclusive interview with Prince Charles.