話をする、言葉をかわす She wanted to have a word with her boss privately.
(彼女は上司と二人きりで話をしたいと思っていた。) have a word with と単数の場合と下の例のように have words with と複数になった場合は意味が異なる。
have words with someone
口論する He had words with a police officer who had stopped his car.
(彼は警官に車を止められ、口論になった。)