lactose vs disaccharide

lactose and disaccharide both are nouns.

Word	Noun	Adjective	Verb	Adverb
lactose	Yes	No	No	No
disaccharide	Yes	No	No	No

As nouns, disaccharide is a hypernym of lactose; that is, disaccharide is a word with a broader meaning than lactose:

lactose: a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk
disaccharide: any of a variety of carbohydrates that yield two monosaccharide molecules on complete hydrolysis

lactose (noun)	disaccharide (noun)
a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk	any of a variety of carbohydrates that yield two monosaccharide molecules on complete hydrolysis