sponsion /sponˈshən/

1. The act of becoming surety for another
2. An agreement or promise made on behalf of another, esp by an individual on behalf of his or her government

sponˈsional adjective

• tree house
• tree houses
• tree-hugger
• tree-huggers
• tree-hugging
• treeing
• tree kangaroo
• tree kangaroos
• treeless
• treelessness
• treelessnesses
• treelike
• tree lilies
• tree lily
• tree line
• tree-lined
• tree mallow
• tree mallows
• tree moss
• tree mosses
• treen
• treenail
• treenails
• treens
• treenware