果实 (guǒshí) means "fruit" in the botanical or formal sense, referring to the mature ovary of a plant that contains seeds. It is more technical than the everyday word 水果, and is used in scientific, literary, or metaphorical contexts such as "the fruits of one's labor."
秋天到了,树上的果实都成熟了。
qiūtiān dào le, shù shàng de guǒshí dōu chéngshú le.
Autumn has arrived, and the fruits on the trees have all ripened.
这种植物的果实很小,但是味道很甜。
zhè zhǒng zhíwù de guǒshí hěn xiǎo, dànshì wèidào hěn tián.
The fruits of this plant are very small, but they taste very sweet.
多年的努力终于结出了丰硕的果实。
duō nián de nǔlì zhōngyú jiéchū le fēngshuò de guǒshí.
Years of hard work have finally borne rich fruit.