Expressions (phrases, clauses, etc.), Ichidan verb
to speak words (of); to speak (to); to say (something); to say some (kind, comforting, etc.) words
彼女にははげましの言葉をかけてあげたらどうですか。Why don't you see if you can't give her a pep talk?
Also written 言葉を掛ける【ことばをかける】