phrase vs ostinato

phrase and ostinato both are nouns.

Word	Noun	Adjective	Verb	Adverb
phrase	Yes	No	Yes	No
ostinato	Yes	No	No	No

As nouns, ostinato is a hyponym of phrase; that is, ostinato is a word with a more specific, narrower meaning than phrase:

Other hyponyms of phrase include ligature.

phrase (noun)	ostinato (noun)
dance movements that are linked in a single choreographic sequence	a musical phrase repeated over and over during a composition
an expression consisting of one or more words forming a grammatical constituent of a sentence
a short musical passage
an expression whose meanings cannot be inferred from the meanings of the words that make it up

phrase (verb)	ostinato (verb)
put into words or an expression
divide, combine, or mark into phrases