Ace and Cucumber

Ace noun - A person with a high level of knowledge or skill in a field.

Cucumber and ace are semantically related In some cases you can use "Cucumber" instead a noun "Ace".

Cucumber noun - A melon vine of the genus Cucumis; cultivated from earliest times for its cylindrical green fruit.

Ace and cucumber are semantically related in paper money topic. Sometimes you can use "Ace" instead a noun "Cucumber".