Synonyms for Spanish Bayonet (same or very similar meaning)
WordNet sense 1 (tall yucca of the southwestern United States and Mexico having a woody stem and stiff swordlike pointed leaves and a large cluster of white flowers):
Yucca baccataWordNet sense 2 (a stiff yucca with a short trunk; found in the southern United States and tropical America; has rigid spine-tipped leaves and clusters of white flowers):
Yucca aloifoliaFrom the ODE community, based on WordNetadd/edit