15-Letter Words Matching O________N_____

There are 19 15-letter words that match O________N_____. 11 are common words, such as OBJECTIVENESSES and OBLIVIOUSNESSES. A rarer one is OVERSWEETNESSES. In this set, E is the most frequent open letter (19 words). 16 words contain a doubled letter.

Full list 19

objectivenessesobliviousnessesobnoxiousnessesobsessivenessesobtrusivenessesoffensivenessesoffhandednessesofficiousnessesoutspokennessesovercompensatedovercompensatesopportunenessesoverbearingnessobstinatenessesoperativenessesovercommunicateovereagernessesoverimaginativeoversweetnesses

About this list

Words
19 (11 common words)
Common example
objectivenesses
Rare example
oversweetnesses
Doubled letters
16
Ending in S
16
Most frequent letter
E (19)

Questions

How many 15-letter words matching o________n_____ are there?

19. 11 of them are common words.

What is a common example?

OBJECTIVENESSES is among the common words in this set.