synecdoche vs figure of speech

synecdoche and figure of speech both are nouns.

Word	Noun	Adjective	Verb	Adverb
synecdoche	Yes	No	No	No
figure of speech	Yes	No	No	No

As nouns, figure of speech is a hypernym of synecdoche; that is, figure of speech is a word with a broader meaning than synecdoche:

synecdoche: substituting a more inclusive term for a less inclusive one or vice versa
figure of speech: language used in a figurative or nonliteral sense

Other hypernyms of synecdoche include figure, image, trope.

synecdoche (noun)	figure of speech (noun)
substituting a more inclusive term for a less inclusive one or vice versa	language used in a figurative or nonliteral sense