pneumococcal vaccine vs vaccine

pneumococcal vaccine and vaccine both are nouns.

Word	Noun	Adjective	Verb	Adverb
pneumococcal vaccine	Yes	No	No	No
vaccine	Yes	No	No	No

As nouns, vaccine is a hypernym of pneumococcal vaccine; that is, vaccine is a word with a broader meaning than pneumococcal vaccine:

pneumococcal vaccine: vaccine (trade name Pneumovax) effective against the 23 most common strains of pneumococcus
vaccine: immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies

Other hypernyms of pneumococcal vaccine include vaccinum.

pneumococcal vaccine (noun)	vaccine (noun)
vaccine (trade name Pneumovax) effective against the 23 most common strains of pneumococcus	immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies