Mono-plural homographs refer to words whose singular forms are the same as their plural forms. The singular form is modified by a/an, and the plural form is modified by many, but the noun does not change its form. Collective noun himself said a lot of people or things. For example, people means a lot of people. Of course, it can no longer be modified by a meaningful a/an. It can be expressed by many people. Since the noun itself contains many meanings, it means that what the noun represents is countable. Collective noun does not have the concept of homomorphism of single and complex numbers, but can only be modified by many things, without singular and plural numbers.