A sucking louse is a parasitic insect that feeds on the blood of its host, which can cause irritation and discomfort. These tiny bugs are also known as lice and can infest different types of animals, including humans, cats, dogs, and birds. While the term "sucking louse" is commonly used, there are also several synonyms that refer to this type of insect. Some of the commonly used synonyms for sucking louse include biting louse, parasitic louse, blood-sucking louse, and wingless louse. These terms are often used interchangeably, and while they may have slightly different connotations, they all refer to the same type of insect.