jalapeno pepper vs jalapeno

jalapeno pepper and jalapeno both are nouns.

Word	Noun	Adjective	Verb	Adverb
jalapeno pepper	Yes	No	No	No
jalapeno	Yes	No	No	No

As nouns, jalapeno pepper and jalapeno are synonyms defined as:

jalapeno pepper and jalapeno: hot green or red pepper of southwestern United States and Mexico

jalapeno pepper (noun)	jalapeno (noun)
hot green or red pepper of southwestern United States and Mexico	hot green or red pepper of southwestern United States and Mexico
	plant bearing very hot and finely tapering long peppers; usually red