The noun 'fruit' as a word for a food substance is an uncountable noun.
The plural form 'fruits' is used exclusively for 'types of' or 'kinds of'; for example:
The fruits needed for this recipe are cherries and blueberries.
Transport is both countable and uncountable as a noun.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Shark is a countable noun.
Countable
countable
The noun 'daytime' is an uncountable noun.
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
Countable
Pasta is a countable noun
The word 'violence' is an uncountable noun.
The gerund painting is a countable noun, as in "There are 12 paintings in this room."