WordFrequencyData

WordFrequencyData[word] gives the frequency of word in typical published English text.

WordFrequencyData[{word1,word2,…}] gives an association of frequencies of the wordi.

WordFrequencyData[word,"TimeSeries"] gives a time series for the frequency of word in typical published English text.

WordFrequencyData[word,"TimeSeries",datespec] gives a time series for dates specified by datespec.

WordFrequencyData[word,"prop"] gives property prop of the word frequency.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.