gray alder(n = noun.plant) alnus incana, grey alder - native to Europe but introduced in America;
is a kind of alder, alder tree
is a member of alnus, genus alnus

african gray, alder, alder blight, alder buckthorn, alder dogwood, alder fly, alder tree, american gray birch, asa gray, ash gray, charcoal gray, common alder, dapple gray, davy's gray, dwarf gray willow, eastern gray squirrel, european black alder, gray, gray area, gray birch, gray catbird, gray eminence, gray flounder, gray fox, gray goldenrod, gray hen, gray jay, gray kingbird, gray lemming, gray market, gray matter, gray mullet, gray partridge, gray polypody, gray poplar, gray sage, gray sea eagle, gray skate, gray snapper, gray sole, gray substance, gray whale, gray willow, gray wolf, great gray owl, green alder, grey alder, hazel alder, mountain alder, oregon alder, oxford gray, payne's gray, pearl gray, red alder, robert gray, seaside alder, silver gray, smooth alder, speckled alder, steel gray, tattletale gray, thomas gray, western gray squirrel, white alder, witch alder, woolly alder aphid