The noun coffee is an uncountable noun as a word for a substance; units of coffee are expressed as a pot of coffee, a cup of coffee, a sack of coffee, a ton of coffee, etc. But like many nouns for substances, the plural form is used for 'types of' or 'kinds of'; for example:
This cafe has an interesting selection of coffees.
The noun coffee is an uncountable (mass) noun, a word for a substance. Multiples of substance nouns are expressed as measures such as cups of coffee, pots of coffee, bags of coffee, etc.
The plural form for substance nouns is reserved for 'types of' or 'kinds of'; for example:
The average coffee shop today has a list of many kinds of coffees.
Transport is both countable and uncountable as a noun.
countable
Uncountable
uncountable
uncountable
The gerund painting is a countable noun, as in "There are 12 paintings in this room."
few is countable
countable
Countable
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
he asked me if the word fire wood countable or uncountable?
Countable