baseball mitt vs mitt

baseball mitt and mitt both are nouns.

Word	Noun	Adjective	Verb	Adverb
baseball mitt	Yes	No	No	No
mitt	Yes	No	No	No

As nouns, baseball mitt and mitt are synonyms defined as:

baseball mitt and mitt: the handwear used by fielders in playing baseball

Other synonyms of baseball mitt include baseball glove, glove.

baseball mitt (noun)	mitt (noun)
the handwear used by fielders in playing baseball	the handwear used by fielders in playing baseball
	the (prehensile) extremity of the superior limb