fermata vs protraction

fermata and protraction both are nouns.

Word	Noun	Adjective	Verb	Adverb
fermata	Yes	No	No	No
protraction	Yes	No	No	No

As nouns, protraction is a hypernym of fermata; that is, protraction is a word with a broader meaning than fermata:

fermata: (music) a prolongation of unspecified length on a note or chord or rest
protraction: the consequence of being lengthened in duration

Other hypernyms of fermata include continuation, lengthiness, prolongation.

fermata (noun)	protraction (noun)
(music) a prolongation of unspecified length on a note or chord or rest	the act of prolonging something
a musical notation (over a note or chord or rest) that indicates it is to be prolonged by an unspecified amount	the consequence of being lengthened in duration