groundball vs grounder

groundball and grounder both are nouns.

Word	Noun	Adjective	Verb	Adverb
groundball	Yes	No	No	No
grounder	Yes	No	No	No

As nouns, groundball and grounder are synonyms defined as:

Other synonyms of groundball include ground ball, hopper.

groundball (noun)	grounder (noun)
(baseball) a hit that travels along the ground	(baseball) a hit that travels along the ground