rating vs bond rating

rating and bond rating both are nouns.

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

As nouns, bond rating is a hyponym of rating; that is, bond rating is a word with a more specific, narrower meaning than rating:

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

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