glucose vs blood sugar

glucose and blood sugar both are nouns.

Word	Noun	Adjective	Verb	Adverb
glucose	Yes	No	No	No
blood sugar	Yes	No	No	No

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

glucose: a monosaccharide sugar that has several forms; an important source of physiological energy
blood sugar: glucose in the bloodstream

Other hyponyms of glucose include glucosamine, corn sugar, dextroglucose, dextrose, grape sugar, blood glucose.

glucose (noun)	blood sugar (noun)
a monosaccharide sugar that has several forms; an important source of physiological energy	glucose in the bloodstream