yuga vs unit of time

yuga and unit of time both are nouns.

Word	Noun	Adjective	Verb	Adverb
yuga	Yes	No	No	No
unit of time	Yes	No	No	No

As nouns, unit of time is a hypernym of yuga; that is, unit of time is a word with a broader meaning than yuga:

yuga: the name of an epoch or era within a four age cycle in Hindu philosophy.
unit of time: a unit for measuring time periods

Other hypernyms of yuga include time unit.

yuga (noun)	unit of time (noun)
the name of an epoch or era within a four age cycle in Hindu philosophy.	a unit for measuring time periods