Quick definitions from WordNet (harbor)

▸ noun:  a place of refuge and comfort and security
▸ noun:  a sheltered port where ships can take on or discharge cargo
▸ verb:  hold back a thought or feeling about ("She is harboring a grudge against him")
▸ verb:  keep in one's possession; of animals
▸ verb:  secretly shelter (as of fugitives or criminals)
▸ verb:  maintain (a theory, thoughts, or feelings) ("Harbor a resentment")
▸ name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #18193)

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▸ Also see harbor