Household-word is a term used to define something that is well-known and popular. There are several synonyms for household-word such as ubiquitous, familiar, popular, famous, well-known, and renowned. These words capture the essence of a term that is widely recognized and understood by many individuals. Another synonym for household-word is celebrated, which implies that the term has gained a level of recognition and importance among a large audience. The use of synonyms helps to expand the language and provide a more nuanced understanding of a particular concept or phrase. Overall, the synonyms for household-word provide insight into the ways in which language is used to describe common and well-known ideas.