caltrop vs Jesuits' nut

caltrop and Jesuits' nut both are nouns.

Word	Noun	Adjective	Verb	Adverb
caltrop	Yes	No	No	No
Jesuits' nut	Yes	No	No	No

As nouns, Jesuits' nut is a hyponym of caltrop; that is, Jesuits' nut is a word with a more specific, narrower meaning than caltrop:

caltrop: a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
Jesuits' nut: a variety of water chestnut

Other hyponyms of caltrop include Trapa natans, water caltrop, ling, ling ko, Trapa bicornis.

caltrop (noun)	Jesuits' nut (noun)
tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed	a variety of water chestnut
Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America
a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits