WordNet sense 1 (light easily worked wood of a tulip tree; used for furniture and veneer):

tulipwood, whitewood, white poplar, true tulipwood

WordNet sense 2 (tall North American deciduous timber tree having large tulip-shaped greenish yellow flowers and conelike fruit; yields soft white woods used especially for cabinet work):

tulip tree, canary whitewood, Liriodendron tulipifera, tulip poplar