Titanian vs massy

Titanian

adj

Of the Titans
Of the faerie queen Titania
Of Titania, the largest moon of Uranus.
Of Titan, the largest moon of Saturn.

noun

An inhabitant of Titan (the Saturnian moon) or of Titania

massy

adj

Heavy; massive.

How often have the words Titanian and massy occurred in a corpus of books? (source: Google Ngram Viewer )