mitt vs baseball mitt

mitt and baseball mitt both are nouns.

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

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

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

Other synonyms of mitt include baseball glove, glove.

mitt (noun)	baseball 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