- alder - wood of any of various alder trees; resistant to underwater rot; used for bridges etc
--1 is a kind of wood
--1 is a substance of alder, alder tree- alder, alder tree - north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the rot-resistant wood
--2 is a kind of tree
--2 is a member of Alnus, genus Alnus
--2 has substances: alder
--2 has particulars: - alder, alder tree - north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the rot-resistant wood