Legionary
Part of speech: noun
Definition: A soldier belonging to a legion; a professional soldier of the ancient Roman army. A member of a legion, such as the American Legion, or of any organization containing the term legion in its title (e.g. the French Foreign Legion).
Part of speech: adjective
Definition: Relating to, or consisting of a legion or legions. Containing a great number.
Legionnaire
Part of speech: noun
Definition: A member of a legion, especially the French Foreign Legion.