10-Letter Words Matching _____R_U__

There are 42 10-letter words that match _____R_U__. 20 are common words, such as BACKGROUND and BUTTERCUPS. A rarer one is SENSORIUMS. In this set, S is the most frequent open letter (31 words). 13 words contain a doubled letter.

Full list 42

Common words

backgroundbuttercupsbutternutscampgroundchartreusecummerbunddeuteriumsfairgroundforegroundjitterbugslitterbugsmisfortune
backgroundbuttercupsbutternutscampgroundchartreusecummerbunddeuteriumsfairgroundforegroundjitterbugslitterbugsmisfortunenewsgroupsplaygroundsubterfugetelluriumsterrariumsturnaroundwanderlustwraparoundanthuriumsbitternutsbutterburscollyriumskummerbundmanubriumsovergroundplaygroupsshowgroundboilersuitcastoreumscriteriumscumberbunddipperfulsdrawerfulsharborfulshausfrauenherbariumsmenstruumssandgrousesemigroupssensoriums

About this list

Words
42 (20 common words)
Common example
background
Rare example
sensoriums
Doubled letters
13
Ending in S
23
Most frequent letter
S (31)

Questions

How many 10-letter words matching _____r_u__ are there?

42. 20 of them are common words.

What is a common example?

BACKGROUND is among the common words in this set.