Mr. Ishikura is my best friend.

There are a lot of pebbles at the bottom of this river.

He picked up a small stone and threw it.

Nepheline is a very important mineral in mineralogy.

Ishizawa is my best friend.

He confronted the darkness like an abyss.

He is totally illiterate and cannot read characters.

The order of this company is very strict.

Her necklace had a beautiful cat's eye stone.

A pronoun is a word used in place of a noun.