blood knot vs barrel knot

blood knot and barrel knot both are nouns.

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

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

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

blood knot (noun)	barrel 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