[tlhIngan Hol] using {ngan} as a suffix {ngan} as the suffix {-ngan}

Perhaps this is a ridiculous question, but since {-ngan} isn't listed in the official klingon suffixes, then how are we able to write {'elaDya'ngan} unless we have the specific word {'elaDya'ngan} in Ca'Non? -- Dana'an https://sacredtextsinklingon.wordpress.com/ Ζεὺς ἦν, Ζεὺς ἐστίν, Ζεὺς ἔσσεται· ὦ μεγάλε Ζεῦ