Nouns

(n)host, legionarchaic terms for army
(n)legionassociation of ex-servicemen“the American Legion”
(n)legiona large military unit“the French Foreign Legion”
(n)horde, host, legiona vast multitude

Adjectives

(s)numerous, legionamounting to a large indefinite number“numerous times”, “the family was numerous”, “Palomar's fans are legion”