walky-talky vs radio link

walky-talky and radio link both are nouns.

Word	Noun	Adjective	Verb	Adverb
walky-talky	Yes	No	No	No
radio link	Yes	No	No	No

As nouns, radio link is a hypernym of walky-talky; that is, radio link is a word with a broader meaning than walky-talky:

walky-talky: small portable radio link (receiver and transmitter)
radio link: a two-way radio communication system (usually microwave); part of a more extensive telecommunication network

Other hypernyms of walky-talky include link.

walky-talky (noun)	radio link (noun)
small portable radio link (receiver and transmitter)	a two-way radio communication system (usually microwave); part of a more extensive telecommunication network