dean vs senior

dean and senior both are nouns.

Word	Noun	Adjective	Verb	Adverb
dean	Yes	No	No	No
senior	Yes	Yes	No	No

As nouns, senior is a hypernym of dean; that is, senior is a word with a broader meaning than dean:

Other hypernyms of dean include elder.

dean (noun)	senior (noun)
an administrator in charge of a division of a university or college	an undergraduate student during the year preceding graduation
(Roman Catholic Church) the head of the College of Cardinals	a person who is older than you are
a man who is the senior member of a group

dean (adjective)	senior (adjective)
	older; higher in rank; longer in length of tenure or service
	used of the fourth and final year in United States high school or college
	advanced in years; (`aged' is pronounced as two syllables)