rat's-tail cactus vs rattail cactus

rat's-tail cactus and rattail cactus both are nouns.

Word	Noun	Adjective	Verb	Adverb
rat's-tail cactus	Yes	No	No	No
rattail cactus	Yes	No	No	No

As nouns, rat's-tail cactus and rattail cactus are synonyms defined as:

rat's-tail cactus and rattail cactus: commonly cultivated tropical American cactus having slender creeping stems and very large showy crimson flowers that bloom for several days

Other synonyms of rat's-tail cactus include Aporocactus flagelliformis.

rat's-tail cactus (noun)	rattail cactus (noun)
commonly cultivated tropical American cactus having slender creeping stems and very large showy crimson flowers that bloom for several days	commonly cultivated tropical American cactus having slender creeping stems and very large showy crimson flowers that bloom for several days