famulus vs attender

famulus and attender both are nouns.

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

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

famulus: a close attendant (as to a scholar)
attender: someone who waits on or tends to or attends to the needs of another

Other hypernyms of famulus include attendant, tender.

famulus (noun)	attender (noun)
a close attendant (as to a scholar)	someone who waits on or tends to or attends to the needs of another
	a person who is present and participates in a meeting
	someone who listens attentively