table-tennis bat vs table-tennis racquet

table-tennis bat and table-tennis racquet both are nouns.

Word	Noun	Adjective	Verb	Adverb
table-tennis bat	Yes	No	No	No
table-tennis racquet	Yes	No	No	No

As nouns, table-tennis bat and table-tennis racquet are synonyms defined as:

table-tennis bat and table-tennis racquet: paddle used to play table tennis

Other synonyms of table-tennis bat include pingpong paddle.

table-tennis bat (noun)	table-tennis racquet (noun)
paddle used to play table tennis	paddle used to play table tennis