Arts news highlights: “A Way With Words: The Power and Art of the Book” at the Children’s Museum of the Arts; “A City for Corduroy: Don Freeman’s New York” at Museum of the City of New York; “The Orchid Show: Singapore” at The New York Botanical Garden; “Moroni: The Riches of Renaissance Portraiture” at The Frick Collection; 50th Anniversary of Dance Theatre of Harlem at New York City Center.