efficiency (n.)

• ability
• able
• ableness
• address
• adept
• adeptness
• adequacy
• adroitness
• airmanship
• applicability
• artfulness
• artisanship
• artistry
• availability
• bravura
• brilliance
• caliber
• capability
• capableness
• capacity
• cleverness
• command
• competence
• competent
• control
• coordination
• craft
• craftsmanship
• cunning
• deftness
• dexterity
• dextrousness
• diplomacy
• effectiveness
• efficaciousness
• efficacy
• efficient
• experience
• expert
• expertise
• expertness
• facility
• faculty
• finesse
• fitness
• flair
• functionality
• genius
• grace
• grip
• handiness
• helpfulness
• horsemanship
• ingeniousness
• ingenuity
• know-how
• marksmanship
• mastership
• mastery
• operability
• performance
• potency
• practicability
• practicality
• productivity
• proficiency
• profitability
• prowess
• qualification
• quickness
• readiness
• resource
• resourcefulness
• savoir-faire
• savvy
• seamanship
• serviceability
• skill
• skillfulness
• style
• sufficiency
• susceptibility
• tact
• tactfulness
• talent
• technique
• timing
• usability
• use
• usefulness
• utility
• virtuosity
• wit
• wizardry
• workmanship