pass completion vs completion

pass completion and completion both are nouns.

Word	Noun	Adjective	Verb	Adverb
pass completion	Yes	No	No	No
completion	Yes	No	No	No

As nouns, pass completion and completion are synonyms defined as:

pass completion and completion: (American football) a successful forward pass in football

pass completion (noun)	completion (noun)
(American football) a successful forward pass in football	a concluding action
	(American football) a successful forward pass in football