effective ~ efficient:
“Effective”, for the right pronunciation, please click here, means ‘capable of bring about some desired, or good result’;
also an “effective” is a soldier ready to fight in the battle,
e.g.
She has made an effective speech on women’s rights.
The police are applying an effective method of controlling drug abuse.
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“Efficient”, forthe right pronunciation, please click here, means ‘working well and giving satisfactory result without waste of time or material’,
e.g.
This new washing machine is more efficient and much cheaper to run.
There is a clear distinction between ‘effective’ and ‘efficient’ though both these words can be used of persons as well as things.
“Keeping a dog is the most effective way of guarding your house.” simply indicates that dogs are good at guarding.
“Keeping a dog is the most efficient way of guarding your house.” suggests that there are other methods you might try to guard your house, but none of them does the job better or with less effort than a dog.
