stem canker vs little potato

stem canker and little potato both are nouns.

Word	Noun	Adjective	Verb	Adverb
stem canker	Yes	No	No	No
little potato	Yes	No	No	No

As nouns, stem canker and little potato are synonyms defined as:

Other synonyms of stem canker include rosette, russet scab.

stem canker (noun)	little potato (noun)
rhizoctinia disease of potatoes	rhizoctinia disease of potatoes