13-Letter Words Matching _________CA__

There are 18 13-letter words that match _________CA__. 5 are common words, such as EXCOMMUNICATE and INCOMMUNICADO. A rarer one is ULTRARADICALS. In this set, I is the most frequent open letter (16 words). 4 words contain a doubled letter.

Full list 18

excommunicateincommunicadoinsignificantprognosticatequadruplicateagrochemicalshypotheticalsnonintoxicantquintuplicatescholasticateagrichemicalsanticlericalsantidesiccantdisintoxicatenonnumericalsproteoglycansstratovolcanoultraradicals

About this list

Words
18 (5 common words)
Common example
excommunicate
Rare example
ultraradicals
Doubled letters
4
Ending in S
7
Most frequent letter
I (16)

Questions

How many 13-letter words matching _________ca__ are there?

18. 5 of them are common words.

What is a common example?

EXCOMMUNICATE is among the common words in this set.