Is forest an example of mass noun?

Answer 1

No, a mass noun or non-count noun is a word that has no plural use. The noun forest is a count noun, the plural form is forests: one forest or many forests.

The most common mass nouns are words for substances and abstract concepts, for example sand and knowledge. Multiples for mass nouns are expressed as buckets of sand, piles of sand, tons of sand and some knowledge, a little knowledge, more knowledge, etc. The plural form for substances is reserved for 'kinds of' or 'types of', for example, 'The best types of sands for the project are fill sand and masonry sand.'

Answer 2

Yes, "forest" is an example of a mass noun. Mass nouns refer to things that cannot be easily counted or separated into individual units, such as "water" or "sand". In the case of forests, you wouldn't typically say "two forests" as you would with countable nouns, like "two trees".