"Pumpkin" is generally considered a countable noun when referring to individual pumpkins, as you can have one pumpkin, two pumpkins, etc. However, when referring to pumpkin as a substance or ingredient (like pumpkin puree), it can be treated as uncountable. Context determines whether it's used as countable or uncountable.
uncountable
uncountable
Uncountable
Transport is both countable and uncountable as a noun.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
The noun 'daytime' is an uncountable noun.
The word 'violence' is an uncountable noun.
The noun 'health' is an uncountable noun, a word for a condition.
"Bun" can be both countable and uncountable. For example, you can say "I bought five buns" or "I would like some bun with my soup."
Yes, the noun 'hydrogen' is an uncountable noun, a word for a substance.
pumpkin is a pumpkin .... potato is a potato!!
It is uncountable. Can you have 3 food? No. The best way to check is to compare it to money and dollars. Money is uncountable and dollars is countable. I can have 3 dollars, but not 3 money.