pecan vs Carya illinoensis

pecan and Carya illinoensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
pecan	Yes	No	No	No
Carya illinoensis	Yes	No	No	No

As nouns, pecan and Carya illinoensis are synonyms defined as:

pecan and Carya illinoensis: tree of southern United States and Mexico cultivated for its nuts

Other synonyms of pecan include Carya illinoinsis, pecan tree.

pecan (noun)	Carya illinoensis (noun)
smooth brown oval nut of south central United States	tree of southern United States and Mexico cultivated for its nuts
tree of southern United States and Mexico cultivated for its nuts
wood of a pecan tree