He is known as a defender of the natural environment.

My mother is working as a carer for my grandfather.

Abstract nouns do not point to specific things.

A common noun refers to a noun that does not point to a specific person or thing.

A mass noun, or 'fukasanmeishi', refers to a noun that cannot be counted with specific numbers.

Year in and year out, we continue to grow.

Social justice means that all people are treated equally.

Let's go eat sushi.

The bird is making a nest in the tree.

This salad seems to need a little more vinegar.