simple sugar vs heptose

simple sugar and heptose both are nouns.

Word	Noun	Adjective	Verb	Adverb
simple sugar	Yes	No	No	No
heptose	Yes	No	No	No

As nouns, heptose is a hyponym of simple sugar; that is, heptose is a word with a more specific, narrower meaning than simple sugar:

simple sugar: a sugar (like sucrose or fructose) that does not hydrolyse to give other sugars; the simplest group of carbohydrates
heptose: a monosaccharide with seven carbon atoms.

Other hyponyms of simple sugar include triose, tetrose, pentose, hexose, aldose, ketose.

simple sugar (noun)	heptose (noun)
a sugar (like sucrose or fructose) that does not hydrolyse to give other sugars; the simplest group of carbohydrates	a monosaccharide with seven carbon atoms.