ticket collector vs doorman

ticket collector and doorman both are nouns.

Word	Noun	Adjective	Verb	Adverb
ticket collector	Yes	No	No	No
doorman	Yes	No	No	No

As nouns, doorman is a hypernym of ticket collector; that is, doorman is a word with a broader meaning than ticket collector:

ticket collector: someone who is paid to admit only those who have purchased tickets
doorman: someone who guards an entrance

Other hypernyms of ticket collector include door guard, doorkeeper, gatekeeper, hall porter, ostiary, porter.

ticket collector (noun)	doorman (noun)
someone who is paid to admit only those who have purchased tickets	someone who guards an entrance