monsoon vs rain

monsoon and rain both are nouns.

Word	Noun	Adjective	Verb	Adverb
monsoon	Yes	No	No	No
rain	Yes	No	Yes	No

As nouns, rain is a hypernym of monsoon; that is, rain is a word with a broader meaning than monsoon:

Other hypernyms of monsoon include rainfall, air current, current of air, wind.

monsoon (noun)	rain (noun)
a seasonal wind in southern Asia; blows from the southwest (bringing rain) in summer and from the northeast in winter	anything happening rapidly or in quick successive
any wind that changes direction with the seasons	water falling in drops from vapor condensed in the atmosphere
rainy season in southern Asia when the southwestern monsoon blows, bringing heavy rains	drops of fresh water that fall as precipitation from clouds

monsoon (verb)	rain (verb)
	precipitate as rain