half-blooded vs half-bred

half-blooded and half-bred both are adjectives.

Word	Noun	Adjective	Verb	Adverb
half-blooded	No	Yes	No	No
half-bred	No	Yes	No	No

As adjectives, half-blooded and half-bred are synonyms defined as:

half-blooded and half-bred: (of animals) having only one purebred parent

Other synonyms of half-blooded include half-breed.

half-blooded (adjective)	half-bred (adjective)
(of animals) having only one purebred parent	(of animals) having only one purebred parent