Correction: What you want to ask is whether the English word slat is a countable noun? The English word slat is a countable noun. The English word slat when used as a countable noun refers to salt (a compound of metal and acid) in chemistry, and when used as an uncountable noun it means table salt. The noun explanation of salt is: interesting; a substance that tastes or looks like salt; something that adds interest and enlivens the atmosphere. The verb explanation of salt is: (like spreading salt) to spread; to make it more interesting; to add salt to... to season; to spread salt on the road (to melt the ice and snow). The plural form of the noun salt is salt. Countable nouns are nouns that can be used for counting. Countable nouns have singular and plural forms. Uncountable nouns are nouns that cannot be directly used for counting. Specific numbers can be used before countable nouns to express specific quantities. Before uncountable nouns Usually the unit word + of is used to express quantity. When a countable noun is used as the subject, the singular and plural of the predicate verb are consistent with the singular and plural of the subject.