Answer:

balsas

Answer	Crossword Clue
BALSAS	Materials for model airplanes
BALSAS	Light woods
BALSAS	Modelers' woods

BALSAS	Trees yielding light lumber
BALSAS	Model-airplane woods
BALSAS	Trees yielding extremely light wood.
BALSAS	Life-saving rafts.
BALSAS	Life rafts.
BALSAS	Logs for building Kon-Tiki.
BALSAS	Trees for the Kon-Tiki.
BALSAS	Light rafts.

BALSAS	Tropical trees.
BALSAS	Trees with soft wood
BALSAS	Trees yielding light wood
BALSAS	Corkwood trees
BALSAS	Life rafts
BALSAS	Fast-growing tropical trees
BALSAS	Trees that yield light wood
BALSAS	Trees that yield light lumber