Thanksgiving cactus vs crab cactus

Thanksgiving cactus and crab cactus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thanksgiving cactus	Yes	No	No	No
crab cactus	Yes	No	No	No

As nouns, Thanksgiving cactus and crab cactus are synonyms defined as:

Thanksgiving cactus and crab cactus: South American jointed cactus with usually red flowers; often cultivated as a houseplant; sometimes classified as genus Schlumbergera

Other synonyms of Thanksgiving cactus include Schlumbergera truncatus, Zygocactus truncatus.

Thanksgiving cactus (noun)	crab cactus (noun)
South American jointed cactus with usually red flowers; often cultivated as a houseplant; sometimes classified as genus Schlumbergera	South American jointed cactus with usually red flowers; often cultivated as a houseplant; sometimes classified as genus Schlumbergera