Pipewort is a plant species that belongs to the family Eriocaulaceae. It is a small, herbaceous plant that is usually found in wetlands and marshes. There are several other words that can be used to describe pipewort, including Eriocaulon, bog button, hat pins, and cotton-threads. The pipewort is characterized by its slender, deep green stem, which is topped with small, round heads of flowers. This plant is native to Europe, Asia, and North America and is used in traditional medicine to treat various ailments. Overall, pipewort, also known as bog buttons or hat pins, is a beautiful and useful plant that has many synonyms in the English language.