Development can be both countable and uncountable depending on the context in which it is used. For example, "the development of a new software" is countable because it refers to a specific instance of development, while "economic development" is uncountable as it represents a broader concept or process.
"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."
Labor can be both countable and uncountable. When referring to work in general, it is uncountable (e.g. "She is dedicated to her work"). However, when referring to specific instances of work or workers, it is countable (e.g. "There are five employees providing labor in the factory").
"Voice" can be both a countable and uncountable noun. When referring to the sound produced by speaking or singing, it is uncountable (e.g. "His voice is beautiful"). However, when referring to separate individual sounds or styles of speaking, it can be countable (e.g. "She has a soothing voice").
Sandwich is countable. You can have one sandwich, two sandwiches, etc.
"Toothbrush" is countable because you can refer to one toothbrush or multiple toothbrushes.
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