wall clock vs clock

wall clock and clock both are nouns.

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

As nouns, clock is a hypernym of wall clock; that is, clock is a word with a broader meaning than wall clock:

wall clock (noun)	clock (noun)
a clock mounted on a wall	a timepiece that shows the time of day

wall clock (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