"Word" here is a synecdoche for "the message of God." The word "them" refers to the crowds. AT: "he taught the message of God to them" (See: [[rc://en/ta/man/translate/figs-synecdoche]]).
Here "everything" is an exaggeration. He explained all his parables. AT: "he explained all his parables" (See: [[rc://en/ta/man/translate/figs-hyperbole]])