Synonyms for Attender (same or very similar meaning)
WordNet sense 1 (someone who listens attentively):
auditor, hearer, listenerWordNet sense 2 (a person who is present and participates in a meeting):
attendant, attendee, meeterWordNet sense 3 (someone who waits on or tends to or attends to the needs of another):
tenderFrom the ODE community, based on WordNetadd/edit