enter vs clock on

enter and clock on both are verbs.

Word	Noun	Adjective	Verb	Adverb
enter	No	No	Yes	No
clock on	No	No	Yes	No

As verbs, clock on is a hyponym of enter; that is, clock on is a word with a more specific, narrower meaning than enter:

enter (verb)	clock on (verb)
set out on (an enterprise or subject of study)	register one's arrival at work
make a record of; set down in permanent form
become a participant; be involved in
put or introduce into something
come on stage
to come or go into
take on duties or office
register formally as a participant or member
be or play a part of or in