What is the abstract noun of adjective laugh?

The Word 'laugh' is not an adjective.

The Word 'laugh' is a verb and a noun.

The noun 'laugh' is a concrete noun as a Word for a physical action or sound. The concrete noun 'laugh' can be used in an abstract context.

Example: He mistook me for a famous movie star. What a laugh!

The noun forms of the verb to laugh are laugher (one who laughs, a concrete noun as a Word for a person), laughter, and the gerund, laughing (concrete nouns as Word for a physical action or sound).

形容词“笑”的抽象名词是“幽默”或“喜剧”，但更直接对应的抽象名词应该是“笑声”。如果是在寻找一个更深层次的概念，可以考虑“幽默感”。具体使用哪个词还需要根据上下文来决定。