bond rating vs rating

bond rating and rating both are nouns.

Word	Noun	Adjective	Verb	Adverb
bond rating	Yes	No	No	No
rating	Yes	No	No	No

As nouns, rating is a hypernym of bond rating; that is, rating is a word with a broader meaning than bond rating:

bond rating: an evaluation by a rating company of the probability that a particular bond issue will default
rating: an appraisal of the value of something

Other hypernyms of bond rating include evaluation, valuation.

bond rating (noun)	rating (noun)
an evaluation by a rating company of the probability that a particular bond issue will default	act of ascertaining or fixing the value or worth of
	an appraisal of the value of something
	standing or position on a scale
	rank in a military organization