orange vs sweet orange

orange and sweet orange both are nouns.

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

As nouns, sweet orange is a hyponym of orange; that is, sweet orange is a word with a more specific, narrower meaning than orange:

Other hyponyms of orange include temple orange, bitter orange, Seville orange, sour orange.

As nouns, sweet orange is a hyponym of orange; that is, sweet orange is a word with a more specific, narrower meaning than orange:

orange: any citrus tree bearing oranges
sweet orange: probably native to southern China; widely cultivated as source of table and juice oranges

orange (noun)	sweet orange (noun)
orange color or pigment; any of a range of colors between red and yellow	orange with sweet juicy pulp; often has a thin skin
round yellow to orange fruit of any of several citrus trees	probably native to southern China; widely cultivated as source of table and juice oranges
any citrus tree bearing oranges
any pigment producing the orange color

orange (adjective)	sweet orange (adjective)
of the color between red and yellow; similar to the color of a ripe orange