Are there any cases where the plural and singular form of an English compound word or noun phrase differ in the number of words contained?
In all cases I can think of, the actual words within the noun phrase will change based on the grammatical number, but the number of words will not.
large red carbecomes
large red carsin plural form. Both phrases have 3 words
these apples- 2 words in each form
Are there any cases where the number of words will be different?
Background: I'm writing an app that performs basic natural language processing and, if my hypothesis is true, I can simplify its implementation significantly.