nowadays vs moment

nowadays and moment both are nouns.

Word	Noun	Adjective	Verb	Adverb
nowadays	Yes	No	No	Yes
moment	Yes	No	No	No

As nouns, moment is a hyponym of nowadays; that is, moment is a word with a more specific, narrower meaning than nowadays:

nowadays: the period of time that is happening now; any continuous stretch of time including the moment of speech
moment: at this time

Other hyponyms of nowadays include now, here and now, present moment, date, nonce, time being, today, tonight.

nowadays (noun)	moment (noun)
the period of time that is happening now; any continuous stretch of time including the moment of speech	having important effects or influence
	the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value
	a turning force produced by an object acting at a distance (or a measure of that force)
	a particular point in time
	an indefinitely short time
	at this time

nowadays (adverb)	moment (adverb)
in these times