broth vs bouillon

broth and bouillon both are nouns.

Word	Noun	Adjective	Verb	Adverb
broth	Yes	No	No	No
bouillon	Yes	No	No	No

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

Other hyponyms of broth include barley water.

broth (noun)	bouillon (noun)
a thin soup of meat or fish or vegetable stock	a clear seasoned broth
liquid in which meat and vegetables are simmered; used as a basis for e.g. soups or sauces