heterosis vs hybrid vigor

heterosis and hybrid vigor both are nouns.

Word	Noun	Adjective	Verb	Adverb
heterosis	Yes	No	No	No
hybrid vigor	Yes	No	No	No

As nouns, heterosis and hybrid vigor are synonyms defined as:

heterosis and hybrid vigor: (genetics) the tendency of a crossbred organism to have qualities superior to those of either parent

heterosis (noun)	hybrid vigor (noun)
(genetics) the tendency of a crossbred organism to have qualities superior to those of either parent	(genetics) the tendency of a crossbred organism to have qualities superior to those of either parent