figured bass vs bass part

figured bass and bass part both are nouns.

Word	Noun	Adjective	Verb	Adverb
figured bass	Yes	No	No	No
bass part	Yes	No	No	No

As nouns, bass part is a hypernym of figured bass; that is, bass part is a word with a broader meaning than figured bass:

figured bass: a bass part written out in full and accompanied by numbers to indicate the chords to be played
bass part: the lowest part in polyphonic music

Other hypernyms of figured bass include bass.

figured bass (noun)	bass part (noun)
a bass part written out in full and accompanied by numbers to indicate the chords to be played	the lowest part in polyphonic music