WordNet sense 1 (a caustic substance produced by heating limestone):

calcium hydroxide, calcium hydrate, caustic lime, hydrated lime, lime hydrate, slaked lime

WordNet sense 2 (a white crystalline oxide used in the production of calcium hydroxide):

quicklime, calx, calcium oxide, burnt lime, calcined lime, fluxing lime, unslaked lime

WordNet sense 3 (a sticky adhesive that is smeared on small branches to capture small birds):

birdlime

WordNet sense 4 (any of various related trees bearing limes):

Citrus aurantifolia, lime tree

WordNet sense 5 (any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber):

basswood, linden, linden tree