jalapeno vs jalapeno pepper

jalapeno and jalapeno pepper both are nouns.

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

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

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

jalapeno (noun)	jalapeno pepper (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