crack willow(n = noun.plant) brittle willow, salix fragilis, snap willow - large willow tree with stiff branches that are easily broken;
is a kind of willow, willow tree
is a member of genus salix, salix

almond willow, almond-leaves willow, arctic willow, arroyo willow, babylonian weeping willow, balsam willow, basket willow, bay willow, bearberry willow, black willow, brittle willow, bush willow, crack, crack addict, crack down, crack down on, crack of doom, crack shot, crack up, creeping willow, cricket-bat willow, desert willow, dwarf gray willow, dwarf grey willow, dwarf willow, fatigue crack, florist's willow, goat willow, golden willow, gray willow, grey willow, hemp willow, hoary willow, huntingdon willow, laurel willow, nasty crack, peach-leaved willow, peachleaf willow, prairie willow, purple willow, pussy willow, quarter crack, red willow, sage willow, sand crack, sea willow, shining willow, silky willow, silver willow, sitka willow, snap willow, swamp willow, take a crack at, toe crack, water willow, weeping willow, white willow, willow, willow aster, willow bell, willow family, willow oak, willow tree, wisconsin weeping willow