great care vs guardianship

great care and guardianship both are nouns.

Word	Noun	Adjective	Verb	Adverb
great care	Yes	No	No	No
guardianship	Yes	No	No	No

As nouns, guardianship is a hypernym of great care; that is, guardianship is a word with a broader meaning than great care:

great care: more attention and consideration than is normally bestowed by prudent persons
guardianship: attention and management implying responsibility for safety

Other hypernyms of great care include care, charge, tutelage.

great care (noun)	guardianship (noun)
more attention and consideration than is normally bestowed by prudent persons	the responsibility of a guardian or keeper
	attention and management implying responsibility for safety