stone fruit vs drupelet

stone fruit and drupelet both are nouns.

Word	Noun	Adjective	Verb	Adverb
stone fruit	Yes	No	No	No
drupelet	Yes	No	No	No

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

stone fruit: fleshy indehiscent fruit with a single seed: e.g. almond, peach, plum, cherry, elderberry, olive, jujube
drupelet: a small part of an aggregate fruit that resembles a drupe

Other hyponyms of stone fruit include almond, peach, plum, cherry, elderberry, Chinese date, Chinese jujube, jujube, olive.

stone fruit (noun)	drupelet (noun)
fleshy indehiscent fruit with a single seed: e.g. almond, peach, plum, cherry, elderberry, olive, jujube	a small part of an aggregate fruit that resembles a drupe