waker vs attender

waker and attender both are nouns.

Word	Noun	Adjective	Verb	Adverb
waker	Yes	No	No	No
attender	Yes	No	No	No

As nouns, attender is a hypernym of waker; that is, attender is a word with a broader meaning than waker:

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

Other hypernyms of waker include attendant, tender.

waker (noun)	attender (noun)
a person who awakes	someone who waits on or tends to or attends to the needs of another
someone who rouses others from sleep	a person who is present and participates in a meeting
	someone who listens attentively