The term 'Poison Ivy Relative' refers to three plants: SUMAC (5 letters), RASH (4 letters), and Mango Tree (9 letters). SUMAC is a shrub or small tree that produces clusters of red or yellow flowers. It is found in North America, Europe, and Asia. RASH is a skin irritation caused by contact with certain plants, such as poison ivy, oak, and SUMAC. Mango Tree is a tropical evergreen tree that produces edible fruit. It is native to India and Southeast Asia, but is now grown in many parts of the world. All three of these plants are related to poison ivy and can cause similar skin reactions.