generation vs time period

generation and time period both are nouns.

Word	Noun	Adjective	Verb	Adverb
generation	Yes	No	No	No
time period	Yes	No	No	No

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

Other hypernyms of generation include period, period of time.

generation (noun)	time period (noun)
the act of producing offspring or multiplying by such production	an amount of time
the production of heat or electricity
a coming into being
group of genetically related organisms constituting a single step in the line of descent
all the people living at the same time or of approximately the same age
the normal time between successive generations
a stage of technological development or innovation