bass drum vs gran casa

bass drum and gran casa both are nouns.

Word	Noun	Adjective	Verb	Adverb
bass drum	Yes	No	No	No
gran casa	Yes	No	No	No

As nouns, bass drum and gran casa are synonyms defined as:

bass drum and gran casa: a large drum with two heads; makes a sound of indefinite but very low pitch

bass drum (noun)	gran casa (noun)
a large drum with two heads; makes a sound of indefinite but very low pitch	a large drum with two heads; makes a sound of indefinite but very low pitch