conceal vs harbour

conceal is not a noun while harbour is a noun.

Word	Noun	Adjective	Verb	Adverb
conceal	No	No	Yes	No
harbour	Yes	No	Yes	No

As verbs, harbour is a hyponym of conceal; that is, harbour is a word with a more specific, narrower meaning than conceal:

conceal (noun)	harbour (noun)
	a place of refuge and comfort and security
	a sheltered port where ships can take on or discharge cargo

conceal (verb)	harbour (verb)
hold back; keep from being perceived by others	maintain (a theory, thoughts, or feelings)
prevent from being seen or discovered	hold back a thought or feeling about
	keep in one's possession; of animals
	secretly shelter (as of fugitives or criminals)