The spelling of <consonant> + 'anin' is rare in English, according to my dictionary of choice (the one I have installed, the Macmillan English Dictionary ['MED' in my comments], which allows me to do 'clever' searches), especially where the a is stressed (as in caning, waning and so on); where the a is unstressed there are a few words such as melanin).Here's some more detailed reference to my source dictionary. Words of this sort are:
- planing (and the derivatives 'aquaplaning' and [pardon me!] 'deplaning'; also 'replaning', I suppose, though The MED doesn't mention that explicitly)
As for Twitter [the word under discussion is Twittersphere] if you had asked me as recently as 2005 whether I thought there was anything interesting about the consonant cluster tw, I would have said 'nothing at all'. If you had suggested that one day it would be the basis for coining hundreds of new words [he has previously mentioned 'twitterhea', 'twitterati', 'twitterholic', 'celebritweet', and many others, listed in full here], I would have said you were mad. Moral: word buffs should never try to predict the future.b
Mammon (When Vowels Get Together V4.0: Collection of Kindle word-lists grouping different pronunciations of vowel-pairs – AA-AU, EA-EU, and IA-IU, and – new for V4.0 – OA-OU. If you buy it, contact @WVGTbook on Twitter and I'll alert you to free downloads of the forthcoming volumes; or click the Following button at the foot of this page.)
And if you have no objection to such promiscuity, Like this.
Freebies (Teaching resources: nearly 32,400 views**, and 4,400 downloads to date. They're very eclectic - mostly EFL and MFL, but one of the most popular is from KS4 History, dating from my PGCE, with 1570 views/700 downloads to date. So it's worth having a browse.)
** This figure includes the count of views for a single resource held in an account that I accidentally created many years ago.