maid of honor vs attendant

maid of honor and attendant both are nouns.

Word	Noun	Adjective	Verb	Adverb
maid of honor	Yes	No	No	No
attendant	Yes	Yes	No	No

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

maid of honor: an unmarried woman who attends the bride at a wedding
attendant: someone who waits on or tends to or attends to the needs of another

Other hypernyms of maid of honor include attender, tender, adult female, woman.

maid of honor (noun)	attendant (noun)
an unmarried woman who attends the bride at a wedding	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

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