We don't have synonyms for quillon yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are quillin, quilon and quillen.
(n) :
Synonym of crossguard (“a metal bar fixed between, and at right angles to, the blade and the handle of a sword or other bladed weapon that stops an opponent's similar weapon from sliding along the blade and injuring the hand of the person wielding the sword”).
(n) :
(chiefly in the plural) Either of the two arms of a crossguard.
(n) :
Synonym of crossguard (“a metal bar fixed between, and at right angles to, the blade and the handle of a sword or other bladed weapon that stops an opponent's similar weapon from sliding along the blade and injuring the hand of the person wielding the sword”).
(n) :
(chiefly in the plural) Either of the two arms of a crossguard.