WordCounts

WordCounts["string"] gives an association whose keys are the distinct words identified in string, and whose values give the number of times those words appear in string.

WordCounts["string",n] gives counts of the distinct n-grams consisting of runs of n words in string.

WordCounts[{string1,string2,…},…] gives the counts for each of the stringi.

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