Grep using list of words from a file.

You need to use the option -f:
$ grep -f A B
The option -F does a fixed string search where as -f is for specifying a file of patterns. You may want both if the file only contains fixed strings and not regexps.
$ grep -Ff A B
You may also want the -w option for matching whole words only:
$ grep -wFf A B
Read man grep for a description of all the possible arguments and what they do.

NOTE: A= file. Searching in file B to see if ANY of the words in file A occur in it.

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