pecan vs Carya illinoinsis

pecan and Carya illinoinsis both are nouns.

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

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

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

Other synonyms of pecan include Carya illinoensis, pecan tree.

pecan (noun)	Carya illinoinsis (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