12-Letter Words Matching ________ER__

There are 97 12-letter words that match ________ER__. 24 are common words, such as ADMINISTERED and ALPHANUMERIC. A rarer one is WOOLGATHERER. In this set, E is the most frequent open letter (73 words). 22 words contain a doubled letter.

Full list 97

Common words

administeredalphanumericbathyspheresboutonnierescantileveredcaravanseraicommandeeredfilibusteredfilibustererforegatheredhelicopteredhydrospheres
administeredalphanumericbathyspheresboutonnierescantileveredcaravanseraicommandeeredfilibusteredfilibustererforegatheredhelicopteredhydrosphereslithospheresmultilateralovermasteredoverwinteredreconsideredrediscoveredtropospheresunconsideredundiscoveredunencumberedunregisteredunrememberedbicollateralcheckerberryglenohumeralhymenopteranlandlubberlylepidopteranmatrilateralmilliamperesmultilayeredmycobacteriaostracodermspatrilateralphotosphericseptilateralserviceberrystigmasteroltroposphericultraliberalunderpoweredunendangeredwhortleberrywoolgatheredantihystericbuffaloberrychandelieredcodiscoveredcodiscoverercryopreservedorsolateralembarcaderosenantiomericenregisteredfellmongeredfootlambertsglasspaperedgrotesqueriehomoiothermshydrospherichymenopteronintergenericinterlayeredjackhammeredjaponaiserielithosphericmicroamperesmicrospheresmonodispersemultitowerednonmetamericoutdeliveredoutglitteredoverconcernsovermanneredozonospheresphotospheresplanispheresplanisphericpolydispersereengineeredrencounteredreregisteredrhizospheressuperalternssuperpoweredthimbleberrytrichopterantrochanteraltrochantericundecipheredundersteeredunembitteredwhigmaleeriewoolgatherer

About this list

Words
97 (24 common words)
Common example
administered
Rare example
woolgatherer
Doubled letters
22
Ending in S
18
Most frequent letter
E (73)

Questions

How many 12-letter words matching ________er__ are there?

97. 24 of them are common words.

What is a common example?

ADMINISTERED is among the common words in this set.