sib vs quint

sib and quint both are nouns.

Word	Noun	Adjective	Verb	Adverb
sib	Yes	No	No	No
quint	Yes	No	No	No

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

Other hyponyms of sib include half blood, quad, quadruplet, quin, quintuplet, triplet, twin.

sib (noun)	quint (noun)
one related by blood or origin; especially on sharing an ancestor with another	one of five children born at the same time from the same pregnancy
a person's brother or sister	the cardinal number that is the sum of four and one