Turnsole is a word with limited use and is rarely used in modern English. It is a plant that is also known as Heliotrope, which is derived from the Greek words helios meaning sun and tropein meaning to turn. In general, the word turnsole means to turn towards the sun or to follow its course. If you are looking for synonyms for the word turnsole, some possible ones are sunflower, sundew, sun rose, or solar. These words also relate to the sun or sunshine, and they might have a broader application in everyday language.