test-cross vs hybridizing

test-cross and hybridizing both are nouns.

Word	Noun	Adjective	Verb	Adverb
test-cross	Yes	No	No	No
hybridizing	Yes	No	No	No

As nouns, hybridizing is a hypernym of test-cross; that is, hybridizing is a word with a broader meaning than test-cross:

test-cross: a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring
hybridizing: (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids

Other hypernyms of test-cross include cross, crossbreeding, crossing, hybridisation, hybridization, interbreeding.

test-cross (noun)	hybridizing (noun)
a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring	(genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids