Is this sentence grammatically corect?
Is this sentence grammatically corect?
Some words , they have a lot similar forms to keep their basic meaning in different parts of speech, as in noun, verb, adj, adv.

You could say something like this instead:

Some words change their form slightly depending on which part of speech they represent.  For example: calculate (verb), calculation (noun), calculated (adjective), calculatedly (adverb).

No, it's not. And it sounds a bit meaningless, too.