dumb cane vs mother-in-law plant

dumb cane and mother-in-law plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
dumb cane	Yes	No	No	No
mother-in-law plant	Yes	No	No	No

As nouns, dumb cane and mother-in-law plant are synonyms defined as:

dumb cane and mother-in-law plant: an evergreen plant with large showy dark green leaves; contains a poison that swells the tongue and throat hence the name

Other synonyms of dumb cane include Dieffenbachia sequine, mother-in-law's tongue.

dumb cane (noun)	mother-in-law plant (noun)
an evergreen plant with large showy dark green leaves; contains a poison that swells the tongue and throat hence the name	an evergreen plant with large showy dark green leaves; contains a poison that swells the tongue and throat hence the name