pear (fruit)
Refers specifically to the fruit of the pear tree. The word 梨 alone can also mean 'pear', but 梨の実 emphasizes the fruit itself.
In autumn, the pears in the garden ripen.
Compound of 梨 (nashi, 'pear') + の (possessive particle) + 実 (mi, 'fruit'). The reading なしのみ is a straightforward combination.