piassava palm vs feather palm

piassava palm and feather palm both are nouns.

Word	Noun	Adjective	Verb	Adverb
piassava palm	Yes	No	No	No
feather palm	Yes	No	No	No

As nouns, feather palm is a hypernym of piassava palm; that is, feather palm is a word with a broader meaning than piassava palm:

piassava palm: Brazilian palm yielding fibers used in making ropes, mats, and brushes
feather palm: palm having pinnate or featherlike leaves

piassava palm (noun)	feather palm (noun)
Brazilian palm yielding fibers used in making ropes, mats, and brushes	palm having pinnate or featherlike leaves