barrel knot vs blood knot

barrel knot and blood knot both are nouns.

Word	Noun	Adjective	Verb	Adverb
barrel knot	Yes	No	No	No
blood knot	Yes	No	No	No

As nouns, barrel knot and blood knot are synonyms defined as:

barrel knot and blood knot: a knot used for tying fishing leaders together; the ends of the two leaders are wrapped around each other two or three times

barrel knot (noun)	blood knot (noun)
a knot used for tying fishing leaders together; the ends of the two leaders are wrapped around each other two or three times	a knot used for tying fishing leaders together; the ends of the two leaders are wrapped around each other two or three times