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--- Can I use the word "less" in this case? I would say that "fewer" is correct. But maybe both are OK.
I know also that it should be "there are" but I noticed that many native speakers use "there is" even when they refer to a group of people/things.
I think a lot of people in the UK (where I am) use 'less' because they have no idea of the correct use of 'fewer'. They also use 'there is' with plurals because they aren't sure about the rules of grammar. Unfortunately, grammar wasn't taught for decades and the vast majority of people here do not know how to create a sentence accurately.
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I think a lot of people in the UK (where I am) use 'less' because they have no idea of the correct use of 'fewer'. They also use 'there is' with plurals because they aren't sure about the rules of grammar. Unfortunately, grammar wasn't taught for decades and the vast majority of people here do not know how to create a sentence accurately.
However, you should use 'there are' and 'fewer'