A bedridden invalid refers to a person who is confined to bed due to sickness or disability. However, there are different ways to describe such individuals. The term "immobile patient" can be used to describe them. "Convalescent" is a word that can be used to describe a person who is recovering but still requires bed rest. "Disabled" can also be used to describe individuals who are bedridden in addition to having physical or mental challenges. Lastly, "chronic illness patient" is a term used to describe individuals who are bedridden due to long-term illnesses that require continuous bed rest. There are many synonyms for the word "bedridden invalid," and it is important to use the correct term to describe the individual's condition.