effeminacy
effeminate
efferent
effervesce
effervescence
effervescency
effervescent
effete
efficacious
efficacy
  efficiency
efficient
effigy
effloresce
efflorescence
effluence
effluent
effluvium
efflux
effort
effortless

    efficiency variance

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We couldn't find phrases with efficiency variance in English to Russian Common Words Pro dictionary.

Phrase with efficiency variance has been found in the following dictionaries:

English-Russian Business
English-Russian Economics