Function: left-word

Move point N words to the left (to the right if N is negative).

Depending on the bidirectional context, this may move either backward
or forward in the buffer. This is in contrast with M-b
and M-f, which see.

Value is normally t.
If an edge of the buffer or a field boundary is reached, point is left there
there and the function returns nil. Field boundaries are not noticed
if `inhibit-field-text-motion' is non-nil.