'Today,' 'present day,' and 'nowadays' all refer to a time that is happening now, but they are used in different ways.
Today is a noun and usually refers to the current calendar day, or this day.
Present day is also a noun and usually refers to the current era or period of time, a time that exists now, and sometimes a period of years or decades or even centuries.
Sometimes present day is used as an adjective.
Nowadays is an adverb that means "at the present time" and it can be used to mean the period of current years, decades, or centuries.
Sometimes today is used as an adverb to mean the same thing as nowadays.
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