arouser vs attendant

arouser and attendant both are nouns.

Word	Noun	Adjective	Verb	Adverb
arouser	Yes	No	No	No
attendant	Yes	Yes	No	No

As nouns, attendant is a hypernym of arouser; that is, attendant is a word with a broader meaning than arouser:

arouser: someone who rouses others from sleep
attendant: someone who waits on or tends to or attends to the needs of another

Other hypernyms of arouser include attender, tender.

arouser (noun)	attendant (noun)
someone who rouses others from sleep	an event or situation that happens at the same time as or in connection with another
	someone who waits on or tends to or attends to the needs of another
	a person who is present and participates in a meeting

arouser (adjective)	attendant (adjective)
	being present (at a meeting or event, etc.)
	occurring with or following as a consequence