What is the word "efficiency group"?

What is the word "effectiveness group"?

Efficiency,

Effective,

Effective,

Efficacy,

Invalid,

Imitation,

Efficacy,

Benefit,

Module efficiency,

Follow the trend,

Actual effect,

Efficient,

Imitation,

Fertilizer efficiency,

Loyalty,

Serve,

Effective death,

Work,

Work efficiency,

Validity,

Replication effect,

Effect,

The magical effect,

Effective,

Effect,

Surrender,

Validity,

Prescription,

Move quickly,

Efficacy,

Performance,

Effective,

Take effect,

Performance,

Effect,

Special effects,

Serve,

Utility,

Imitation,

efficacy