fruit sugar vs fructose

fruit sugar and fructose both are nouns.

Word	Noun	Adjective	Verb	Adverb
fruit sugar	Yes	No	No	No
fructose	Yes	No	No	No

As nouns, fruit sugar and fructose are synonyms defined as:

fruit sugar and fructose: a simple sugar found in honey and in many ripe fruits

Other synonyms of fruit sugar include laevulose, levulose.

fruit sugar (noun)	fructose (noun)
a simple sugar found in honey and in many ripe fruits	a simple sugar found in honey and in many ripe fruits