sweet pepper vs sweet pepper

sweet pepper and sweet pepper both are nouns.

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

sweet pepper (noun)	sweet pepper (noun)
large mild crisp thick-walled capsicum peppers usually bell-shaped or somewhat oblong; commonly used in salads	large mild crisp thick-walled capsicum peppers usually bell-shaped or somewhat oblong; commonly used in salads
plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers	plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers