I like soporific and clandestine but I don't know what credenza means. 

What about disambiguation? 

I had to Google credenza.

A credenza is a piece of furniture comprising a central cupboard flanked by symmetrical quadrant glass display cabinets, usually made of burnished and polished wood and decorated withmarquetry.

Me too 

It's definitely a good word. And not often used.

Ostentatious ?

Acetabuliform

 erinaceous

Mellifluous is a nice word.

I like floccinaucinihilipilificationism too.

One day I'll be able to pronounce it.

this is the only time I've ever heard the word  (whoever posted this can't spell) 

Thank you, EC.

Cosmo,

I have a word similar that I broke down into chunks and learnt it that way. It took a surprisingly short period of time. I learnt it years ago, hardly ever use it, but never seem to forget it. The word is -

Nahasapeemapetilon (Nahasa-peema-petilon)

For those who are wondering, it is the name of the Quickie Mart owner in The Simpsons, Apu Nahasapeemapetilon. 

Gentian - pronounced Jen-shun.

No idea why i love that word - its a flower and can be a purple dye

I do like that one Saint.

I'm adding geomorphogeny to my liked words list.

"to study the origins of land forms"

Persephone.

The daughter of Zeus.