hospitalization vs time period

hospitalization and time period both are nouns.

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

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

Other hypernyms of hospitalization include period, period of time.

hospitalization (noun)	time period (noun)
placing in medical care in a hospital	an amount of time
insurance that pays all or part of a patient's hospital expense
the condition of being treated as a patient in a hospital
a period of time when you are confined to a hospital