timepiece vs clock

timepiece and clock both are nouns.

Word	Noun	Adjective	Verb	Adverb
timepiece	Yes	No	No	No
clock	Yes	No	Yes	No

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

Other hyponyms of timepiece include atomic clock, sandglass, sundial, timer, ticker, watch.

timepiece (noun)	clock (noun)
a measuring instrument or device for keeping time	a timepiece that shows the time of day

timepiece (verb)	clock (verb)
	measure the time or duration of an event or action or the person who performs an action in a certain period of time