I want to know that can we always use a plural verb with a plural subject or a plural noun like take this example -:
We are nerd.
or
We are nerds.
is correct
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Sign up to join this community"Nerd" is a noun - not a verb. You have to use the plural "nerds" because you are referring to more than one person by using "we".
We are nerds.
The verb in both your sentences is "are", which is the correct plural form when you are speaking about more than one person. If it was one singular person then it would be:
I am a nerd.
OR
He is a nerd.
"Nerdy" is an adjective derived from the word "nerd" - adjectives in English do not take the plural ending, so this would be the same no matter what the subject:
We are nerdy.
He is nerdy.
Tricky question!
In this case, you will find that "We are nerds" (plural) is far, far more commonly used, but your first example is also valid if you consider 'nerd' as a group, in the same manner as "We are family" - hence things like https://www.weare-nerd.com/ and https://www.wearenerd.it/