hybridisation vs coupling

hybridisation and coupling both are nouns.

Word	Noun	Adjective	Verb	Adverb
hybridisation	Yes	No	No	No
coupling	Yes	No	No	No

As nouns, coupling is a hypernym of hybridisation; that is, coupling is a word with a broader meaning than hybridisation:

hybridisation: (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
coupling: the act of pairing a male and female for reproductive purposes

Other hypernyms of hybridisation include conjugation, mating, pairing, sexual union, union.

hybridisation (noun)	coupling (noun)
(genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids	the act of pairing a male and female for reproductive purposes
	a mechanical device that serves to connect the ends of adjacent objects
	a connection (like a clamp or vise) between two things so they move together