burger vs beefburger

burger and beefburger both are nouns.

Word	Noun	Adjective	Verb	Adverb
burger	Yes	No	No	No
beefburger	Yes	No	No	No

As nouns, burger and beefburger are synonyms defined as:

burger and beefburger: a sandwich consisting of a fried cake of minced beef served on a bun, often with other ingredients

Other synonyms of burger include hamburger.

burger (noun)	beefburger (noun)
a sandwich consisting of a fried cake of minced beef served on a bun, often with other ingredients	a sandwich consisting of a fried cake of minced beef served on a bun, often with other ingredients