experticity 

A word used by non-experts to make themselves sound like an expert. Has more syllables than the word expertise, thus the speaker attempts to sound more intelligent, but usually fails.

Eddie: "Are you finished yet dude? I have important things to do like watch mold grow."
Brandon: "I am trying to share my experticity with you, now that you are a single guy"
Eddie: "I don't get paid enough to have to hear this, go down the hall and share it with Ray."

experticity by dave_the_thinker December 28, 2017

expertivity 

Synonym of expertise.

Drummond asked Brady questions regarding his expertivity on Holy Scripture.

expertivity by JDatx512 August 19, 2008

Expertitis. 

An affliction that causes considerable problems for people who become so expert at their chosen line of study or research that no one can understand those who have expertitis.

I've become so expert at dealing with highly specialized cases of wrongfully arrested cases that I have difficulty teaching my craft to others. That's Expertitis.

That's problematic because the truth is that a law degree is of no use to any would be expert who wants to specialize in the sort of cases that I deal with.

I have a 100% success rate, but "Expertitis" makes it difficult for me to understand why amateurs can't do what I do.

Expertitis. by The Trial Wrecker. February 25, 2011