Count

A count noun is a noun that can have a plural.

a cat, one cat, the cat; cats, some cats, many cats, ten cats
life. lives.
advantage. advantages
mile. miles

A non-count noun is a noun that has no plural.

indigestion
haste
mayonaise
granite
justice

Some nouns can at times be count, at other times non-count.

wine
- Non-Count: “I drink wine with every meal.”
- Count: “This store sells many fine wines.”
virtue
- Non-Count: “Vice is always at war with virtue.”
- Count: “Justice and prudence are cardinal virtues.”