harbor vs asylum

harbor and asylum both are nouns.

Word	Noun	Adjective	Verb	Adverb
harbor	Yes	No	Yes	No
asylum	Yes	No	No	No

As nouns, asylum is a hypernym of harbor; that is, asylum is a word with a broader meaning than harbor:

Other hypernyms of harbor include refuge, sanctuary.

harbor (noun)	asylum (noun)
a place of refuge and comfort and security	a hospital for mentally incompetent or unbalanced person
a sheltered port where ships can take on or discharge cargo	a shelter from danger or hardship

harbor (verb)	asylum (verb)
maintain (a theory, thoughts, or feelings)
hold back a thought or feeling about
keep in one's possession; of animals
secretly shelter (as of fugitives or criminals)