The term 'line of business' is a broad term that can refer to any type of business activity. The two crossword solutions for this term are 'TRADE' and 'onemomentplease'. 'TRADE' is a five-letter word that refers to the buying and selling of goods or services. This could include anything from retail stores to online marketplaces. 'Onemomentplease' is a fifteen-letter phrase that refers to customer service. This could include anything from answering customer inquiries to providing technical support. Both of these terms are related to the line of business and can be used to describe different aspects of it.