http://www.merriam-webster.com/dictionary/monstrance
: a vessel in which the consecrated Host is exposed for the adoration of the faithful
TABERNACLE: A receptacle for the consecrated elements of the Eucharist (Mirriam-Webster).
Your "proof" states; A Monstrance is a receptical for holding holy objects for display. A consecrated host is a holy object. Therefore all holy objects are consecrated hosts. No thanks, I'll stick to the Pontificale Romanum for my definitions and to real legitimate logic.