false fruit vs quince

false fruit and quince both are nouns.

Word	Noun	Adjective	Verb	Adverb
false fruit	Yes	No	No	No
quince	Yes	No	No	No

As nouns, quince is a hyponym of false fruit; that is, quince is a word with a more specific, narrower meaning than false fruit:

false fruit: a fleshy fruit (apple or pear or related fruits) having seed chambers and an outer fleshy part
quince: aromatic acid-tasting pear-shaped fruit used in preserves

Other hyponyms of false fruit include apple, pear.

false fruit (noun)	quince (noun)
a fleshy fruit (apple or pear or related fruits) having seed chambers and an outer fleshy part	aromatic acid-tasting pear-shaped fruit used in preserves
	small Asian tree with pinkish flowers and pear-shaped fruit; widely cultivated