concern vs encumbrance

concern and encumbrance both are nouns.

Word	Noun	Adjective	Verb	Adverb
concern	Yes	No	Yes	No
encumbrance	Yes	No	No	No

As nouns, encumbrance is a hyponym of concern; that is, encumbrance is a word with a more specific, narrower meaning than concern:

Other hyponyms of concern include bugaboo, burden, incumbrance, load, onus, business.

concern (noun)	encumbrance (noun)
something that interests you because it is important or affects you	any obstruction that impedes or is burdensome
something or someone that causes anxiety; a source of unhappiness	an onerous or difficult concern
a feeling of sympathy for someone or something	a charge against property (as a lien or mortgage)
an anxious feeling
a commercial or industrial enterprise and the people who constitute it

concern (verb)	encumbrance (verb)
be relevant to
be on the mind of