cicatrix vs keloid

cicatrix and keloid both are nouns.

Word	Noun	Adjective	Verb	Adverb
cicatrix	Yes	No	No	No
keloid	Yes	No	No	No

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

cicatrix: a mark left (usually on the skin) by the healing of injured tissue
keloid: raised pinkish scar tissue at the site of an injury; results from excessive tissue repair

Other hyponyms of cicatrix include callus, cheloid, pockmark, sword-cut, vaccination.

cicatrix (noun)	keloid (noun)
a mark left (usually on the skin) by the healing of injured tissue	raised pinkish scar tissue at the site of an injury; results from excessive tissue repair