pull-up vs chin-up

pull-up and chin-up both are nouns.

Word	Noun	Adjective	Verb	Adverb
pull-up	Yes	No	No	No
chin-up	Yes	No	No	No

As nouns, pull-up and chin-up are synonyms defined as:

pull-up and chin-up: an arm exercise performed by pulling yourself up on a horizontal bar until your chin is level with the bar

pull-up (noun)	chin-up (noun)
an arm exercise performed by pulling yourself up on a horizontal bar until your chin is level with the bar	an arm exercise performed by pulling yourself up on a horizontal bar until your chin is level with the bar
a roadside cafe especially for lorry drivers