pitahaya vs pitahaya cactus

pitahaya and pitahaya cactus both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitahaya	Yes	No	No	No
pitahaya cactus	Yes	No	No	No

As nouns, pitahaya and pitahaya cactus are synonyms defined as:

pitahaya and pitahaya cactus: cactus of the southwestern United States and northern Mexico having edible juicy fruit

Other synonyms of pitahaya include Acanthocereus pentagonus, Acanthocereus tetragonus.

pitahaya (noun)	pitahaya cactus (noun)
highly colored edible fruit of pitahaya cactus having bright red juice; often as large as a peach	cactus of the southwestern United States and northern Mexico having edible juicy fruit
cactus of the southwestern United States and northern Mexico having edible juicy fruit