Hircocervus

Meaning: as the OED says "A fabulous creature, half goat, half stag." They are of course using fabulous meaning 'out of fable' but I like the ambiguity.

Usefulness: 2 (Perhaps as an insult? Unless you happen to be haunting the halls of Winchester College, of course.)

Logofascination: 2 (The name is from the Latin for billy-goat and stag; another name is the tragelaph, from the Greek for the same creatures.  The genus to which Kudu belong are called Tragelaphus for this reason.)

In the wild: Michael Quinion found it in Umberto Eco, and has written it up here, and as mentioned in both that and the Wikipedia article, the hircocervus comes to us via philosophy. Plato introduced it as an example* and Aristotle takes it further; if you have the brain-power you can read up on the goat-stag in philosophy here.  It also makes a brief appearance in my favourite passage of The Horologicon; the hircocervus is one of the midnight creatures who gather around.

Paroemiographer

Meaning: a writer or collector of proverbs.

Usefulness: 1 (I'm considering adding this to my resume. Could also be applied to Twitter, where there are a number of people attempting to find or coin the most applicable proverb of the day.)

Logofascination: 2 (This word gets points just for existing.)

Anfractuous

Meaning:  sinuous, twisty, winding or craggy, rugged, coarse, rough, uneven. Whoever wrote the wiktionary definition decided to save time, and make it a (slightly poetic) list of synonyms as well as a definition. To be fair, the OED has "Winding, sinuous, involved; roundabout, circuitous; spiral" or "rugged, craggy". Apparently conjunctions are not necessary when it comes to this word.

Usefulness: 1 ("Your anfractuous arguments do not deceive me, good sir!" "My GPS'* route may be anfractuous, but you can't deny it is scenic.")

Logofascination: 1 (Various sources suggest that, etymologically, it is a cousin to the rather lovely frangible.)

Imberb

Meaning: beardless

Usefulness: 2 ( Could be used as faint praise; "You look particularly imberb today" would be interpreted almost entirely on tone.)

Logofascination: 1 (this is a French word which is listed in Cotgrave, but neither Rabelais nor Urquhart use it. The OED has a citation for imberbic from 1623, but imberb doesn't get one until Aldous Huxley in 1923, for which see below. Where did it go for 300 years?)

Cupidon

Meaning: a little cupid (a putti), possibly cupids plural, but in Dickens' Our Mutual Friend, the name for Lady Tippins' little black book, or, really, ledger, from which she is "always booking a new lover, or striking out an old lover, or putting a lover in her black list, or promoting a lover to her blue list, or adding up her lovers, or otherwise posting her book." Methinks milady would've enjoyed Facebook, or accounting.

Usefulness: 3 (flippantly or seriously of contacts or Facebook: Let me consult my cupidon!)

Logofascination: 3