Yes, sacrum is a Scrabble word!

...and is worth 10 points in Scrabble, and 13 points in Words with Friends

sacrum

Noun

1. Wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx

What Scrabble words can I make with the letters in sacrum?

5 Letter Words

arcus
arums
crams
marcs
muras
musca
ramus
scaur
scram
scrum
sumac

4 Letter Words

amus
arcs
arms
arum
cams
cars
cram
crus
curs
macs
marc
mars
mura
rams
rums
scam
scar
scum
sura
ursa

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Words that can be created with an extra letter added to sacrum:

S:sacrums