second sacker vs second baseman

second sacker and second baseman both are nouns.

Word	Noun	Adjective	Verb	Adverb
second sacker	Yes	No	No	No
second baseman	Yes	No	No	No

As nouns, second sacker and second baseman are synonyms defined as:

second sacker and second baseman: (baseball) the person who plays second base

second sacker (noun)	second baseman (noun)
(baseball) the person who plays second base	(baseball) the person who plays second base