example - a bunch of keys (bunch is the collective noun), pride of lions (pride is the collective noun)
Aggregate nouns - words comprising of an indefinite number of parts
example - goods, data
Aggregate nouns, unlike collective nouns, use plural verbs and cannot be used with 'a' or 'an'.
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But stiil there is a problem. If you visit the following page, you'll see a list of agreegate nouns that have been classified into singular and plural forms. The rule you described about the indefinite articles works fine with the plural forms of the nouns but it seems a bit shacky with the singular forms.
Please explain is there any other way to identify aggregate nouns.
I looked at the site you listed. Some of the words "look" singular but they are aggregatae and take a plural verb. There has been heated debate (twice!) on this site about whether "police" takes a plural or singular verb, but the site you referene shoes that police, like cattle, swine, clergy, etc., all take the plural verb.
I don't have a good way to help you identify which words are aggregate nouns - I wish I did, but I think you just have to learn them.
Can you be more specific about your questions regarding them?
People are waiting to help.
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